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Paris Judicial Court ordered Google to block additional pirate sports-streaming domains at the DNS level, rejecting Google's argument that enforcement should target upstream providers like Cloudflare first. "The blockade was requested by Canal+ and aims to stop pirate streams of Champions League games," notes TorrentFreak. From the report: Most recently, Google was compelled to take action following a complaint from French broadcaster Canal+ and its subsidiaries regarding Champions League piracy.. Like previous blocking cases, the request is grounded in Article L. 333-10 of the French Sports Code, which enables rightsholders to seek court orders against any entity that can help to stop 'serious and repeated' sports piracy. After reviewing the evidence and hearing arguments from both sides, the Paris Court granted the blocking request, ordering Google to block nineteen domain names, including antenashop.site, daddylive3.com, livetv860.me, streamysport.org and vavoo.to. The latest blocking order covers the entire 2025/2026 Champions League series, which ends on May 30, 2026. It's a dynamic order too, which means that if these sites switch to new domains, as verified by ARCOM, these have to be blocked as well. Google objected to the blocking request. Among other things, it argued that several domains were linked to Cloudflare's CDN. Therefore, suspending the sites on the CDN level would be more effective, as that would render them inaccessible. Based on the subsidiarity principle, Google argued that blocking measures should only be ordered if attempts to block the pirate sites through more direct means have failed. The court dismissed these arguments, noting that intermediaries cannot dictate the enforcement strategy or blocking order. Intermediaries cannot require "prior steps" against other technical intermediaries, especially given the "irremediable" character of live sports piracy. The judge found the block proportional because Google remains free to choose the technical method, even if the result is mandated. Internet providers, search engines, CDNs, and DNS resolvers can all be required to block, irrespective of what other measures were taken previously. Google further argued that the blocking measures were disproportionate because they were complex, costly, easily bypassed, and had effects beyond the borders of France. The Paris court rejected these claims. It argued that Google failed to demonstrate that implementing these blocking measures would result in "important costs" or technical impossibilities. Additionally, the court recognized that there would still be options for people to bypass these blocking measures. However, the blocks are a necessary step to "completely cease" the infringing activities.

Read more of this story at Slashdot.

Microsoft is embedding full e-commerce checkout directly into Copilot chats, letting users buy products without ever visiting a retailer's website. "If checkout happens inside AI conversations, retailers risk losing direct customer relationships -- while platforms like Microsoft gain leverage," reports Axios. From the report: Microsoft unveiled new agentic AI tools for retailers at the NRF 2026 retail conference, including Copilot Checkout, which lets shoppers complete purchases inside Copilot without being redirected to a retailer's website. The checkout feature is live in the U.S. with Shopify, PayPal, Stripe and Etsy integrations. Copilot apps have more than 100 million monthly active users, spanning consumer and commercial audiences, according to the company. More than 800 million monthly active users interact with AI features across Microsoft products more broadly. Shopping journeys involving Copilot are 33% shorter than traditional search paths and see a 53% increase in purchases within 30 minutes of interaction, Microsoft says. When shopping intent is present, journeys involving Copilot are 194% more likely to result in a purchase than those without it.

Read more of this story at Slashdot.

An anonymous reader quotes a report from Ars Technica: The Federal Communications Commission plans to authorize a new category of wireless devices in the 6 GHz Wi-Fi band that will be permitted to operate at higher power levels than currently allowed. The FCC will also consider authorizing higher power levels for certain wireless devices that are only allowed to operate indoors. The FCC said it scheduled a vote for its January 29 meeting on an order "to create a new category of unlicensed devices... that can operate outdoors and at higher power than previously authorized devices." These so-called Geofenced variable power (GVP) devices operating on the 6 GHz band will "support high data rates suitable for AR/VR, short-range hotspots, automation, and indoor navigation," and "overcome limitations of previous device classes by allowing higher power and outdoor mobility," the FCC said. They will be required to work with geofencing systems to avoid interference with fixed microwave links and radio astronomy observatories. FCC Chairman Brendan Carr attributed the FCC's planned action to President Trump in a press release titled, "President Trump Unleashes American Innovation With 6 GHz Win." That's consistent with Carr's relatively new stance that the FCC takes orders from the president, despite his insisting during the Biden era that the FCC must operate independently from the White House. While many of Carr's regulatory decisions have been criticized by consumer advocates, the 6 GHz action is an exception. Michael Calabrese, of New America's Open Technology Institute, told Ars that "increasing the power levels for Wi-Fi connections to peripheral devices such as AR/VR is a big win for consumers" and a change that has been "long advocated by the Wi-Fi community." Carr said that the FCC "will vote on an order that expands unlicensed operations in the 6 GHz band so that consumers can benefit from better, faster Wi-Fi and an entirely new generation of wireless devices -- from AR/VR and IoT to a range of innovative smart devices. [It] will do so through a set of forward-looking regulations that allow devices to operate at higher power while protecting incumbent users, including through geofencing systems." [...] A draft of the order said the planned "additional power will enable composite standard-power/LPI access points to increase indoor coverage and provide more versatility to American consumers." The FCC will also seek comment on a proposal to authorize LPI access points on cruise ships.

Read more of this story at Slashdot.

The long-standing hierarchy in the TV market -- Sony, Samsung and LG at the top, TCL and Hisense fighting it out in the midrange -- is eroding as the budget brands close the performance gap and increasingly lead on technology innovation, The Verge writes. Hisense debuted the first RGB LED TV last year, and TCL's X11L announced at CES 2026 is the first TV to use reformulated quantum dots and a new color filter. TCL's QM9K release last year was "a pretty clear statement that they're ready to fight with the big boys." The premium brands retain certain advantages: Sony's processing remains unmatched and LG's OLEDs deliver contrast that mini LED cannot match. "Even as the gap in performance across technologies continues to shrink, and TVs from all the manufacturers get closer to parity, the challenge for TCL and Hisense shifts from creating incredible, competitive products to altering perception," The Verge notes. Samsung once owned the art TV segment entirely; CES 2026 saw announcements from Amazon's Ember Artline and LG's Gallery TV, all using similar edge-lit technology and magnetic frames. The experience across brands is "remarkably similar." If the pricing gap persists and performance remains comparable, "the big three will have to respond by bringing their pricing down or risk losing sales," the publication concluded.

Read more of this story at Slashdot.

An anonymous reader shares a report: Internet access available through mobile devices in Iran appears to be limited, according to several social media accounts that routinely track such developments. Cloudflare Radar, which monitors internet traffic on behalf of the internet infrastructure firm Cloudflare, said on Thursday that IPv6 (Internet Protocol version 6), a standard widely used for mobile infrastructure, was affected. "IPv6 address space in Iran dropped by 98.5 per cent, concurrent with IPv6 traffic share dropping from 12 per cent to 1.8 per cent, as the government selectively blocks internet access amid protests," read Cloudflare Radar's social post. NetBlocks, which tracks internet access and digital rights around the world, also confirmed it was seeing problems with connectivity through various internet providers in Iran. "Live network data show Tehran and other parts of Iran are now entering a digital blackout," NetBlocks posted on X.

Read more of this story at Slashdot.

The promise of AI-powered workplace tools that sort emails, take meeting notes, and file expense reports is finally delivering meaningful productivity gains -- one software startup reported a 20% boost around mid-2025 -- but companies are discovering an unexpected tradeoff: employees are burning out from the relentless pace of high-level cognitive work. Roger Kirkness, CEO of 14-person software startup Convictional, noticed that after AI took the scut work off his team's plates, their days became consumed by intensive thinking, and they were mentally exhausted and unproductive by Friday. The company transitioned to a four-day workweek; the same amount of work gets done, Kirkness says. The underlying problem, according to Boston College economist and sociologist Juliet Schor, is that businesses tend to simply reallocate the time AI saves. Workers who once mentally downshifted for tasks like data entry are now expected to maintain intense focus through longer stretches of data analysis. "If you just make people work at a high-intensity pace with no breaks, you risk crowding out creativity," Schor says.

Read more of this story at Slashdot.

Version:6.18.4 (stable) Released:2026-01-08 Source:linux-6.18.4.tar.xz PGP Signature:linux-6.18.4.tar.sign Patch:full (incremental) ChangeLog:ChangeLog-6.18.4

Version:6.12.64 (longterm) Released:2026-01-08 Source:linux-6.12.64.tar.xz PGP Signature:linux-6.12.64.tar.sign Patch:full (incremental) ChangeLog:ChangeLog-6.12.64

Last month, I attended the GNOME.Asia Summit 2025 held at the IIJ office in Tokyo. This was my fourth time attending the summit, following previous events in Taipei (2010), Beijing (2015), and Delhi (2016).

As I live near Tokyo, this year’s conference was a unique experience for me: an opportunity to welcome the international GNOME community to my home city rather than traveling abroad. Reconnecting with the community after several years provided a helpful perspective on how our ecosystem has evolved.

Addressing the post-quantum transition

During the summit, I delivered a keynote address regarding post-quantum cryptography (PQC) and desktop. The core of my presentation focused on the “Harvest Now, Decrypt Later” (HNDL) type of threats, where encrypted data is collected today with the intent of decrypting it once quantum computing matures. The talk was followed by the history and the current status of PQC support in crypto libraries including OpenSSL, GnuTLS, and NSS, and concluded with the next steps recommended for the users and developers.

It is important to recognize that classical public key cryptography, which is vulnerable to quantum attacks, is integrated into nearly every aspect of the modern desktop: from secure web browsing and apps using libsoup (Maps, Weather, etc.) to the underlying verification of system updates. Given that major government timelines (such as NIST and the NSA’s CNSA 2.0) are pushing for a full migration to quantum-resistant algorithms between 2027 and 2035, the GNU/Linux desktop should prioritize “crypto-agility” to remain secure in the coming decade.

From discussion to implementation: Crypto Usage Analyzer

One of the tools I discussed during my talk was crypto-auditing, a project designed to help developers identify and update the legacy cryptography usage. At the time of the summit, the tool was limited to a command-line interface, which I noted was a barrier to wider adoption.

Inspired by the energy of the summit, I spent part of the recent holiday break developing a GUI for crypto-auditing. By utilizing AI-assisted development tools, I was able to rapidly prototype an application, which I call “Crypto Usage Analyzer”, that makes the auditing data more accessible.

Conclusion

The summit in Tokyo had a relatively small audience, which resulted in a cozy and professional atmosphere. This smaller scale proved beneficial for technical exchange, as it allowed for focused discussions on desktop-related topics than is often possible at larger conferences.

Attending GNOME.Asia 2025 was a reminder of the steady work required to keep the desktop secure and relevant. I appreciate the efforts of the organizing committee in bringing the summit to Tokyo, and I look forward to continuing my work on making security libraries and tools more accessible for our users and developers.

Graphics drivers in Flatpak have been a bit of a pain point. The drivers have to be built against the runtime to work in the runtime. This usually isn’t much of an issue but it breaks down in two cases:

1. If the driver depends on a specific kernel version
2. If the runtime is end-of-life (EOL)

The first issue is what the proprietary Nvidia drivers exhibit. A specific user space driver requires a specific kernel driver. For drivers in Mesa, this isn’t an issue. In the medium term, we might get lucky here and the Mesa-provided Nova driver might become competitive with the proprietary driver. Not all hardware will be supported though, and some people might need CUDA or other proprietary features, so this problem likely won’t go away completely.

Currently we have runtime extensions for every Nvidia driver version which gets matched up with the kernel version, but this isn’t great.

The second issue is even worse, because we don’t even have a somewhat working solution to it. A runtime which is EOL doesn’t receive updates, and neither does the runtime extension providing GL and Vulkan drivers. New GPU hardware just won’t be supported and the software rendering fallback will kick in.

How we deal with this is rather primitive: keep updating apps, don’t depend on EOL runtimes. This is in general a good strategy. A EOL runtime also doesn’t receive security updates, so users should not use them. Users will be users though and if they have a goal which involves running an app which uses an EOL runtime, that’s what they will do. From a software archival perspective, it is also desirable to keep things working, even if they should be strongly discouraged.

In all those cases, the user most likely still has a working graphics driver, just not in the flatpak runtime, but on the host system. So one naturally asks oneself: why not just use that driver?

That’s a load-bearing “just”. Let’s explore our options.

Exploration

Attempt #1: Bind mount the drivers into the runtime.

Cool, we got the driver’s shared libraries and ICDs from the host in the runtime. If we run a program, it might work. It might also not work. The shared libraries have dependencies and because we are in a completely different runtime than the host, they most likely will be mismatched. Yikes.

Attempt #2: Bind mount the dependencies.

We got all the dependencies of the driver in the runtime. They are satisfied and the driver will work. But your app most likely won’t. It has dependencies that we just changed under its nose. Yikes.

Attempt #3: Linker magic.

Until here everything is pretty obvious, but it turns out that linkers are actually quite capable and support what’s called linker namespaces. In a single process one can load two completely different sets of shared libraries which will not interfere with each other. We can bind mount the host shared libraries into the runtime, and dlmopen the driver into its own namespace. This is exactly what libcapsule does. It does have some issues though, one being that the libc can’t be loaded into multiple linker namespaces because it manages global resources. We can use the runtime’s libc, but the host driver might require a newer libc. We can use the host libc, but now we contaminate the apps linker namespace with a dependency from the host.

Attempt #4: Virtualization.

All of the previous attempts try to load the host shared objects into the app. Besides the issues mentioned above, this has a few more fundamental issues:

1. The Flatpak runtimes support i386 apps; those would require a i386 driver on the host, but modern systems only ship amd64 code.
2. We might want to support emulation of other architectures later
3. It leaks an awful lot of the host system into the sandbox
4. It breaks the strict separation of the host system and the runtime

If we avoid getting code from the host into the runtime, all of those issues just go away, and GPU virtualization via Virtio-GPU with Venus allows us to do exactly that.

The VM uses the Venus driver to record and serialize the Vulkan commands, sends them to the hypervisor via the virtio-gpu kernel driver. The host uses virglrenderer to deserializes and executes the commands.

This makes sense for VMs, but we don’t have a VM, and we might not have the virtio-gpu kernel module, and we might not be able to load it without privileges. Not great.

It turns out however that the developers of virglrenderer also don’t want to have to run a VM to run and test their project and thus added vtest, which uses a unix socket to transport the commands from the mesa Venus driver to virglrenderer.

It also turns out that I’m not the first one who noticed this, and there is some glue code which allows Podman to make use of virgl.

You can most likely test this approach right now on your system by running two commands:

rendernodes=(/dev/dri/render*) virgl_test_server --venus --use-gles --socket-path /tmp/flatpak-virgl.sock --rendernode "${rendernodes[0]}" & flatpak run --nodevice=dri --filesystem=/tmp/flatpak-virgl.sock --env=VN_DEBUG=vtest --env=VTEST_SOCKET_NAME=/tmp/flatpak-virgl.sock org.gnome.clocks

If we integrate this well, the existing driver selection will ensure that this virtualization path is only used if there isn’t a suitable driver in the runtime.

Implementation

Obviously the commands above are a hack. Flatpak should automatically do all of this, based on the availability of the dri permission.

We actually already start a host program and stop it when the app exits: xdg-dbus-proxy. It’s a bit involved because we have to wait for the program (in our case virgl_test_server) to provide the service before starting the app. We also have to shut it down when the app exits, but flatpak is not a supervisor. You won’t see it in the output of ps because it just execs bubblewrap (bwrap) and ceases to exist before the app even started. So instead we have to use the kernel’s automatic cleanup of kernel resources to signal to virgl_test_server that it is time to shut down.

The way this is usually done is via a so called sync fd. If you have a pipe and poll the file descriptor of one end, it becomes readable as soon as the other end writes to it, or the file description is closed. Bubblewrap supports this kind of sync fd: you can hand in a one end of a pipe and it ensures the kernel will close the fd once the app exits.

One small problem: only one of those sync fds is supported in bwrap at the moment, but we can add support for multiple in Bubblewrap and Flatpak.

For waiting for the service to start, we can reuse the same pipe, but write to the other end in the service, and wait for the fd to become readable in Flatpak, before exec’ing bwrap with the same fd. Also not too much code.

Finally, virglrenderer needs to learn how to use a sync fd. Also pretty trivial. There is an older MR which adds something similar for the Podman hook, but it misses the code which allows Flatpak to wait for the service to come up, and it never got merged.

Overall, this is pretty straight forward.

Conclusion

The virtualization approach should be a robust fallback for all the cases where we don’t get a working GPU driver in the Flatpak runtime, but there are a bunch of issues and unknowns as well.

It is not entirely clear how forwards and backwards compatible vtest is, if it even is supposed to be used in production, and if it provides a strong security boundary.

None of that is a fundamental issue though and we could work out those issues.

It’s also not optimal to start virgl_test_server for every Flatpak app instance.

Given that we’re trying to move away from blanket dri access to a more granular and dynamic access to GPU hardware via a new daemon, it might make sense to use this new daemon to start the virgl_test_server on demand and only for allowed devices.

Hey hey happy new year, friends! Today I was going over some V8 code that touched pre-tenuring: allocating objects directly in the old space instead of the nursery. I knew the theory here but I had never looked into the mechanism. Today’s post is a quick overview of how it’s done.

allocation sites

In a JavaScript program, there are a number of source code locations that allocate. Statistically speaking, any given allocation is likely to be short-lived, so generational garbage collection partitions freshly-allocated objects into their own space. In that way, when the system runs out of memory, it can preferentially reclaim memory from the nursery space instead of groveling over the whole heap.

But you know what they say: there are lies, damn lies, and statistics. Some programs are outliers, allocating objects in such a way that they don’t die young, or at least not young enough. In those cases, allocating into the nursery is just overhead, because minor collection won’t reclaim much memory (because too many objects survive), and because of useless copying as the object is scavenged within the nursery or promoted into the old generation. It would have been better to eagerly tenure such allocations into the old generation in the first place. (The more I think about it, the funnier pre-tenuring is as a term; what if some PhD programs could pre-allocate their graduates into named chairs? Is going straight to industry the equivalent of dying young? Does collaborating on a paper with a full professor imply a write barrier? But I digress.)

Among the set of allocation sites in a program, a subset should pre-tenure their objects. How can we know which ones? There is a literature of static techniques, but this is JavaScript, so the answer in general is dynamic: we should observe how many objects survive collection, organized by allocation site, then optimize to assume that the future will be like the past, falling back to a general path if the assumptions fail to hold.

my runtime doth object

The high-level overview of how V8 implements pre-tenuring is based on per-program-point AllocationSite objects, and per-allocation AllocationMemento objects that point back to their corresponding AllocationSite. Initially, V8 doesn’t know what program points would profit from pre-tenuring, and instead allocates everything in the nursery. Here’s a quick picture:

A linear allocation buffer containing objects allocated with allocation mementos

Here we show that there are two allocation sites, Site1 and Site2. V8 is currently allocating into a linear allocation buffer (LAB) in the nursery, and has allocated three objects. After each of these objects is an AllocationMemento; in this example, M1 and M3 are AllocationMemento objects that point to Site1 and M2 points to Site2. When V8 allocates an object, it increments the “created” counter on the corresponding AllocationSite (if available; it’s possible an allocation comes from C++ or something where we don’t have an AllocationSite).

When the free space in the LAB is too small for an allocation, V8 gets another LAB, or collects if there are no more LABs in the nursery. When V8 does a minor collection, as the scavenger visits objects, it will look to see if the object is followed by an AllocationMemento. If so, it dereferences the memento to find the AllocationSite, then increments its “found” counter, and adds the AllocationSite to a set. Once an AllocationSite has had 100 allocations, it is enqueued for a pre-tenuring decision; sites with 85% survival get marked for pre-tenuring.

If an allocation site is marked as needing pre-tenuring, the code in which it is embedded it will get de-optimized, and then next time it is optimized, the code generator arranges to allocate into the old generation instead of the default nursery.

Finally, if a major collection collects more than 90% of the old generation, V8 resets all pre-tenured allocation sites, under the assumption that pre-tenuring was actually premature.

tenure for me but not for thee

What kinds of allocation sites are eligible for pre-tenuring? Sometimes it depends on object kind; wasm memories, for example, are almost always long-lived, so they are always pre-tenured. Sometimes it depends on who is doing the allocation; allocations from the bootstrapper, literals allocated by the parser, and many allocations from C++ go straight to the old generation. And sometimes the compiler has enough information to determine that pre-tenuring might be a good idea, as when it generates a store of a fresh object to a field in an known-old object.

But otherwise I thought that the whole AllocationSite mechanism would apply generally, to any object creation. It turns out, nope: it seems to only apply to object literals, array literals, and new Array. Weird, right? I guess it makes sense in that these are the ways to create objects that also creates the field values at creation-time, allowing the whole block to be allocated to the same space. If instead you make a pre-tenured object and then initialize it via a sequence of stores, this would likely create old-to-new edges, preventing the new objects from dying young while incurring the penalty of copying and write barriers. Still, I think there is probably some juice to squeeze here for pre-tenuring of class-style allocations, at least in the optimizing compiler or in short inline caches.

I suspect this state of affairs is somewhat historical, as the AllocationSite mechanism seems to have originated with typed array storage strategies and V8’s “boilerplate” object literal allocators; both of these predate per-AllocationSite pre-tenuring decisions.

fin

Well that’s adaptive pre-tenuring in V8! I thought the “just stick a memento after the object” approach is pleasantly simple, and if you are only bumping creation counters from baseline compilation tiers, it likely amortizes out to a win. But does the restricted application to literals point to a fundamental constraint, or is it just accident? If you have any insight, let me know :) Until then, happy hacking!

Wikipedia says “An IBM PC compatible is any personal computer that is hardware- and software-compatible with the IBM Personal Computer (IBM PC) and its subsequent models”. But what does this actually mean? The obvious literal interpretation is for a device to be PC compatible, all software originally written for the IBM 5150 must run on it. Is this a reasonable definition? Is it one that any modern hardware can meet?

Before we dig into that, let’s go back to the early days of the x86 industry. IBM had launched the PC built almost entirely around off-the-shelf Intel components, and shipped full schematics in the IBM PC Technical Reference Manual. Anyone could buy the same parts from Intel and build a compatible board. They’d still need an operating system, but Microsoft was happy to sell MS-DOS to anyone who’d turn up with money. The only thing stopping people from cloning the entire board was the BIOS, the component that sat between the raw hardware and much of the software running on it. The concept of a BIOS originated in CP/M, an operating system originally written in the 70s for systems based on the Intel 8080. At that point in time there was no meaningful standardisation - systems might use the same CPU but otherwise have entirely different hardware, and any software that made assumptions about the underlying hardware wouldn’t run elsewhere. CP/M’s BIOS was effectively an abstraction layer, a set of code that could be modified to suit the specific underlying hardware without needing to modify the rest of the OS. As long as applications only called BIOS functions, they didn’t need to care about the underlying hardware and would run on all systems that had a working CP/M port.

By 1979, boards based on the 8086, Intel’s successor to the 8080, were hitting the market. The 8086 wasn’t machine code compatible with the 8080, but 8080 assembly code could be assembled to 8086 instructions to simplify porting old code. Despite this, the 8086 version of CP/M was taking some time to appear, and a company called Seattle Computer Products started producing a new OS closely modelled on CP/M and using the same BIOS abstraction layer concept. When IBM started looking for an OS for their upcoming 8088 (an 8086 with an 8-bit data bus rather than a 16-bit one) based PC, a complicated chain of events resulted in Microsoft paying a one-off fee to Seattle Computer Products, porting their OS to IBM’s hardware, and the rest is history.

But one key part of this was that despite what was now MS-DOS existing only to support IBM’s hardware, the BIOS abstraction remained, and the BIOS was owned by the hardware vendor - in this case, IBM. One key difference, though, was that while CP/M systems typically included the BIOS on boot media, IBM integrated it into ROM. This meant that MS-DOS floppies didn’t include all the code needed to run on a PC - you needed IBM’s BIOS. To begin with this wasn’t obviously a problem in the US market since, in a way that seems extremely odd from where we are now in history, it wasn’t clear that machine code was actually copyrightable. In 1982 Williams v. Artic determined that it could be even if fixed in ROM - this ended up having broader industry impact in Apple v. Franklin and it became clear that clone machines making use of the original vendor’s ROM code wasn’t going to fly. Anyone wanting to make hardware compatible with the PC was going to have to find another way.

And here’s where things diverge somewhat. Compaq famously performed clean-room reverse engineering of the IBM BIOS to produce a functionally equivalent implementation without violating copyright. Other vendors, well, were less fastidious - they came up with BIOS implementations that either implemented a subset of IBM’s functionality, or didn’t implement all the same behavioural quirks, and compatibility was restricted. In this era several vendors shipped customised versions of MS-DOS that supported different hardware (which you’d think wouldn’t be necessary given that’s what the BIOS was for, but still), and the set of PC software that would run on their hardware varied wildly. This was the era where vendors even shipped systems based on the Intel 80186, an improved 8086 that was both faster than the 8086 at the same clock speed and was also available at higher clock speeds. Clone vendors saw an opportunity to ship hardware that outperformed the PC, and some of them went for it.

You’d think that IBM would have immediately jumped on this as well, but no - the 80186 integrated many components that were separate chips on 8086 (and 8088) based platforms, but crucially didn’t maintain compatibility. As long as everything went via the BIOS this shouldn’t have mattered, but there were many cases where going via the BIOS introduced performance overhead or simply didn’t offer the functionality that people wanted, and since this was the era of single-user operating systems with no memory protection, there was nothing stopping developers from just hitting the hardware directly to get what they wanted. Changing the underlying hardware would break them.

And that’s what happened. IBM was the biggest player, so people targeted IBM’s platform. When BIOS interfaces weren’t sufficient they hit the hardware directly - and even if they weren’t doing that, they’d end up depending on behavioural quirks of IBM’s BIOS implementation. The market for DOS-compatible but not PC-compatible mostly vanished, although there were notable exceptions - in Japan the PC-98 platform achieved significant success, largely as a result of the Japanese market being pretty distinct from the rest of the world at that point in time, but also because it actually handled Japanese at a point where the PC platform was basically restricted to ASCII or minor variants thereof.

So, things remained fairly stable for some time. Underlying hardware changed - the 80286 introduced the ability to access more than a megabyte of address space and would promptly have broken a bunch of things except IBM came up with an utterly terrifying hack that bit me back in 2009, and which ended up sufficiently codified into Intel design that it was one mechanism for breaking the original XBox security. The first 286 PC even introduced a new keyboard controller that supported better keyboards but which remained backwards compatible with the original PC to avoid breaking software. Even when IBM launched the PS/2, the first significant rearchitecture of the PC platform with a brand new expansion bus and associated patents to prevent people cloning it without paying off IBM, they made sure that all the hardware was backwards compatible. For decades, PC compatibility meant not only supporting the officially supported interfaces, it meant supporting the underlying hardware. This is what made it possible to ship install media that was expected to work on any PC, even if you’d need some additional media for hardware-specific drivers. It’s something that still distinguishes the PC market from the ARM desktop market. But it’s not as true as it used to be, and it’s interesting to think about whether it ever was as true as people thought.

Let’s take an extreme case. If I buy a modern laptop, can I run 1981-era DOS on it? The answer is clearly no. First, modern systems largely don’t implement the legacy BIOS. The entire abstraction layer that DOS relies on isn’t there, having been replaced with UEFI. When UEFI first appeared it generally shipped with a Compatibility Services Module, a layer that would translate BIOS interrupts into UEFI calls, allowing vendors to ship hardware with more modern firmware and drivers without having to duplicate them to support older operating systems1. Is this system PC compatible? By the strictest of definitions, no.

Ok. But the hardware is broadly the same, right? There’s projects like CSMWrap that allow a CSM to be implemented on top of stock UEFI, so everything that hits BIOS should work just fine. And well yes, assuming they implement the BIOS interfaces fully, anything using the BIOS interfaces will be happy. But what about stuff that doesn’t? Old software is going to expect that my Sound Blaster is going to be on a limited set of IRQs and is going to assume that it’s going to be able to install its own interrupt handler and ACK those on the interrupt controller itself and that’s really not going to work when you have a PCI card that’s been mapped onto some APIC vector, and also if your keyboard is attached via USB or SPI then reading it via the CSM will work (because it’s calling into UEFI to get the actual data) but trying to read the keyboard controller directly won’t2, so you’re still actually relying on the firmware to do the right thing but it’s not, because the average person who wants to run DOS on a modern computer owns three fursuits and some knee length socks and while you are important and vital and I love you all you’re not enough to actually convince a transglobal megacorp to flip the bit in the chipset that makes all this old stuff work.

But imagine you are, or imagine you’re the sort of person who (like me) thinks writing their own firmware for their weird Chinese Thinkpad knockoff motherboard is a good and sensible use of their time - can you make this work fully? Haha no of course not. Yes, you can probably make sure that the PCI Sound Blaster that’s plugged into a Thunderbolt dock has interrupt routing to something that is absolutely no longer an 8259 but is pretending to be so you can just handle IRQ 5 yourself, and you can probably still even write some SMM code that will make your keyboard work, but what about the corner cases? What if you’re trying to run something built with IBM Pascal 1.0? There’s a risk that it’ll assume that trying to access an address just over 1MB will give it the data stored just above 0, and now it’ll break. It’d work fine on an actual PC, and it won’t work here, so are we PC compatible?

That’s a very interesting abstract question and I’m going to entirely ignore it. Let’s talk about PC graphics3. The original PC shipped with two different optional graphics cards - the Monochrome Display Adapter and the Color Graphics Adapter. If you wanted to run games you were doing it on CGA, because MDA had no mechanism to address individual pixels so you could only render full characters. So, even on the original PC, there was software that would run on some hardware but not on other hardware.

Things got worse from there. CGA was, to put it mildly, shit. Even IBM knew this - in 1984 they launched the PCjr, intended to make the PC platform more attractive to home users. As well as maybe the worst keyboard ever to be associated with the IBM brand, IBM added some new video modes that allowed displaying more than 4 colours on screen at once4, and software that depended on that wouldn’t display correctly on an original PC. Of course, because the PCjr was a complete commercial failure, it wouldn’t display correctly on any future PCs either. This is going to become a theme.

There’s never been a properly specified PC graphics platform. BIOS support for advanced graphics modes5 ended up specified by VESA rather than IBM, and even then getting good performance involved hitting hardware directly. It wasn’t until Microsoft specced DirectX that anything was broadly usable even if you limited yourself to Microsoft platforms, and this was an OS-level API rather than a hardware one. If you stick to BIOS interfaces then CGA-era code will work fine on graphics hardware produced up until the 20-teens, but if you were trying to hit CGA hardware registers directly then you’re going to have a bad time. This isn’t even a new thing - even if we restrict ourselves to the authentic IBM PC range (and ignore the PCjr), by the time we get to the Enhanced Graphics Adapter we’re not entirely CGA compatible. Is an IBM PC/AT with EGA PC compatible? You’d likely say “yes”, but there’s software written for the original PC that won’t work there.

And, well, let’s go even more basic. The original PC had a well defined CPU frequency and a well defined CPU that would take a well defined number of cycles to execute any given instruction. People could write software that depended on that. When CPUs got faster, some software broke. This resulted in systems with a Turbo Button - a button that would drop the clock rate to something approximating the original PC so stuff would stop breaking. It’s fine, we’d later end up with Windows crashing on fast machines because hardware details will absolutely bleed through.

So, what’s a PC compatible? No modern PC will run the DOS that the original PC ran. If you try hard enough you can get it into a state where it’ll run most old software, as long as it doesn’t have assumptions about memory segmentation or your CPU or want to talk to your GPU directly. And even then it’ll potentially be unusable or crash because time is hard.

The truth is that there’s no way we can technically describe a PC Compatible now - or, honestly, ever. If you sent a modern PC back to 1981 the media would be amazed and also point out that it didn’t run Flight Simulator. “PC Compatible” is a socially defined construct, just like “Woman”. We can get hung up on the details or we can just chill.

1. Windows 7 is entirely happy to boot on UEFI systems except that it relies on being able to use a BIOS call to set the video mode during boot, which has resulted in things like UEFISeven to make that work on modern systems that don’t provide BIOS compatibility ↩︎

2. Back in the 90s and early 2000s operating systems didn’t necessarily have native drivers for USB input devices, so there was hardware support for trapping OS accesses to the keyboard controller and redirecting that into System Management Mode where some software that was invisible to the OS would speak to the USB controller and then fake a response anyway that’s how I made a laptop that could boot unmodified MacOS X ↩︎

3. (my name will not be Wolfwings Shadowflight) ↩︎

4. Yes yes ok 8088 MPH demonstrates that if you really want to you can do better than that on CGA ↩︎

5. and by advanced we’re still talking about the 90s, don’t get excited ↩︎

Much like the s3-glib library I put together recently, I had another itch to scratch. What would it look like to have a PostgreSQL driver that used futures and fibers with libdex? This was something I wondered about more than a decade ago when writing the libmongoc network driver for 10gen (later MongoDB).

pgsql-glib is such a library which I made to wrap the venerable libpq PostgreSQL state-machine library. It does operations on fibers and awaits FD I/O to make something that feels synchronous even though it is not.

It also allows for something more “RAII-like” using g_autoptr() which interacts very nicely with fibers.

API Documentation can be found here.

It is once again that pre-GSoC time of year where I go around asking GNOME developers for project ideas they are willing to mentor during Google Summer of Code. GSoC is approaching fast, and we should aim to get a preliminary list of project ideas by the end of January.

Internships offer an opportunity for new contributors to join our community and help us build the software we love.

@Mentors, please submit new proposals in our Project Ideas GitLab repository.

Proposals will be reviewed by the GNOME Internship Committee and posted at https://gsoc.gnome.org/2026. If you have any questions, please don’t hesitate to contact us.