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I am very happy to announce a new version of Casilda!

A simple Wayland compositor widget for Gtk 4.

This release comes with several new features, bug fixes and extra polish that it is making it start to feel like a proper compositor.

It all started with a quick 1.2 release to port it to wlroots 0.19 because 0.18 was removed from Debian, while doing this on my new laptop I was able to reproduce a texture leak crash which lead to 1.2.1 and a fix in Gtk by Benjamin to support Vulkan drivers that return dmabufs with less fd than planes.

At this point I was invested to I decided to fix the rest of issues in the backlog…

Fractional scale

Casilda only supported integer scales not fractional scale so you could set your display scale to 200% but not 125%.

For reference this is how gtk4-demo looks like at 100% or scale 1 where 1 application/logical pixel corresponds to one device/display pixel.

*** Keep in mind its preferable to see all the following images without fractional scale itself and at full size ***

Clients would render at the next round scale if the application was started with a fractional scale set…

Or the client would render at scale 1 and look blurry if you switched from 1 to a fractional scale.

In both cases the input did not matched with the renderer window making the application really broken.

So if the client application draws a 4 logical pixel border, it will be 5 pixels in the backing texture this means that 1 logical pixel correspond to 1.25 device pixels. So in order for things to look sharp CasildaCompositor needs to make sure the coordinates it uses for position the client window will match to the device pixel grid.

My first attempt was to do

((int)x * scale) / scale

but that still looked blurry, and that is because I assumed window coordinate 0,0 was the same as its backing surface coordinates 0,0 but that is not the case because I forgot about the window shadow. Luckily there is API to get the offset, then all you have to do is add the logical position of the compositor widget and you get the surface origin coordinates

gtk_native_get_surface_transform (GTK_NATIVE (root), &surface_origin_x, &surface_origin_y); /* Add widget offset */ if (gtk_widget_compute_point (self, GTK_WIDGET (root), &GRAPHENE_POINT_INIT (0, 0), &out_point)) { surface_origin_x += out_point.x; surface_origin_y += out_point.y; }

Once I had that I could finally calculate the right position

/* Snap logical coordinates to device pixel grid */ if (scale > 1.0) { x = floorf ((x + surface_origin_x) * scale) / scale - surface_origin_x; y = floorf ((y + surface_origin_y) * scale) / scale - surface_origin_y; }

And this is how it looks now with 1.25 fractional scale.

Keyboard layouts

Another missing feature was support for different keyboard layouts so switching layouts would work on clients too. Not really important for Cambalache but definitely necessary for a generic compositor.

Popups positioners

Casilda now send clients all the necessary information for positioning popups in a place where they do not get cut out of the display area which is a nice thing to have.

Cursor shape protocol

Current versions of Gtk 4 requires cursor shape protocol on wayland otherwise it fallback to 32×32 pixel size cursors which might not be the same size of your system cursors and look blurry with fractional scales.

In this case the client send an cursor id instead of a pixel buffer when it wants to change the cursor.

This was really easy to implement as all I had to do is call

gtk_widget_set_cursor_from_name (compositor, wlr_cursor_shape_v1_name (event->shape)); Greetings

As usual this would not be possible without the help of the community, special thanks to emersion, Matthias and Benjamin for their help and support.

Release Notes

• • Add fractional scale support
  • Add viewporter support
  • Add support for cursor shape
  • Forward keyboard layout changes to clients.
  • Improve virtual size calculation
  • Fix maximized/fullscreen auto resize on compositor size allocation
  • Add support for popups reposition
  • Fix GdkTexture leak

Fixed Issues

• • #5 “Track keymap layout changes”
  • #12 “Support for wlroots-0.19”
  • #13 “Wrong cursor size on client windows”
  • #14 “Support for fractional scaling snap to device grid”
  • #19 Add support for popups reposition
  • #16 Firefox GTK backdrop/shadow not scaled correctly

Where to get it?

Source code lives on GNOME gitlab here

git clone https://gitlab.gnome.org/jpu/casilda.git Matrix channel

Have any question? come chat with us at #cambalache:gnome.org

Mastodon

Follow me in Mastodon @xjuan to get news related to Casilda and Cambalache development.

Happy coding!

Version:6.19.13 (stable) Released:2026-04-18 Source:linux-6.19.13.tar.xz PGP Signature:linux-6.19.13.tar.sign Patch:full (incremental) ChangeLog:ChangeLog-6.19.13

Version:6.18.23 (longterm) Released:2026-04-18 Source:linux-6.18.23.tar.xz PGP Signature:linux-6.18.23.tar.sign Patch:full (incremental) ChangeLog:ChangeLog-6.18.23

Version:6.12.82 (longterm) Released:2026-04-18 Source:linux-6.12.82.tar.xz PGP Signature:linux-6.12.82.tar.sign Patch:full (incremental) ChangeLog:ChangeLog-6.12.82

Version:6.6.135 (longterm) Released:2026-04-18 Source:linux-6.6.135.tar.xz PGP Signature:linux-6.6.135.tar.sign Patch:full (incremental) ChangeLog:ChangeLog-6.6.135

Version:6.1.169 (longterm) Released:2026-04-18 Source:linux-6.1.169.tar.xz PGP Signature:linux-6.1.169.tar.sign Patch:full (incremental) ChangeLog:ChangeLog-6.1.169

Version:5.15.203 (longterm) Released:2026-04-18 Source:linux-5.15.203.tar.xz PGP Signature:linux-5.15.203.tar.sign Patch:full (incremental) ChangeLog:ChangeLog-5.15.203

Version:5.10.253 (longterm) Released:2026-04-18 Source:linux-5.10.253.tar.xz PGP Signature:linux-5.10.253.tar.sign Patch:full (incremental) ChangeLog:ChangeLog-5.10.253

If you have recently installed a very up-to-date Linux distribution with a desktop environment, or upgraded your system on a rolling-release distribution, you might have noticed that your home directory has a new folder: “Projects”

Why?

With the recent 0.20 release of xdg-user-dirs we enabled the “Projects” directory by default. Support for this has already existed since 2007, but was never formally enabled. This closes a more than 11 year old bug report that asked for this feature.

The purpose of the Projects directory is to give applications a default location to place project files that do not cleanly belong into one of the existing categories (Documents, Music, Pictures, Videos). Examples of this are software engineering projects, scientific projects, 3D printing projects, CAD design or even things like video editing projects, where project files would end up in the “Projects” directory, with output video being more at home in “Videos”.

By enabling this by default, and subsequently in the coming months adding support to GLib, Flatpak, desktops and applications that want to make use of it, we hope to give applications that do operate in a “project-centric” manner with mixed media a better default storage location. As of now, those tools either default to the home directory, or will clutter the “Documents” folder, both of which is not ideal. It also gives users a default organization structure, hopefully leading to less clutter overall and better storage layouts.

This sucks, I don’t like it!

As usual, you are in control and can modify your system’s behavior. If you do not like the “Projects” folder, simply delete it! The xdg-user-dirs utility will not try to create it again, and instead adjust the default location for this directory to your home directory. If you want more control, you can influence exactly what goes where by editing your ~/.config/user-dirs.dirs configuration file.

If you are a system administrator or distribution vendor and want to set default locations for the default XDG directories, you can edit the /etc/xdg/user-dirs.defaults file to set global defaults that affect all users on the system (users can still adjust the settings however they like though).

What else is new?

Besides this change, the 0.20 release of xdg-user-dirs brings full support for the Meson build system (dropping Automake), translation updates, and some robustness improvements to its code. We also fixed the “arbitrary code execution from unsanitized input” bug that the Arch Linux Wiki mentions here for the xdg-user-dirs utility, by replacing the shell script with a C binary.

Thanks to everyone who contributed to this release!

NASA has revived support for the European Space Agency's long-delayed Rosalind Franklin Mars rover mission. According to the space agency, the current plan is to launch via a SpaceX Falcon Heavy no earlier than 2028. Engadget reports: This is a partnership between NASA and the ESA, with the European agency providing the rover, the spacecraft and the lander. The US will provide braking engines for the lander, heater units for the rover's internal systems and, of course, assistance with the actual launch. The rover will be outfitted with scientific instruments to look for signs of ancient life on the red planet. These include a state-of-the-art mass spectrometer and an organic molecule analyzer, which will come in handy as the vehicle collects samples at the Oxia Planum landing site. The mission has been stuck in development limbo since 2001, with delays caused by budget problems, technical issues, shifting international partners, and geopolitical fallout. After NASA dropped out, Russia stepped in, then was cut loose after invading Ukraine, and now -- despite NASA rejoining in 2024 and fresh political budget threats -- the rover is tentatively back on track for a 2028 launch.

Read more of this story at Slashdot.

An anonymous reader quotes a report from the Guardian: The critical Atlantic current system appears significantly more likely to collapse than previously thought after new research found that climate models predicting the biggest slowdown are the most realistic. Scientists called the new finding "very concerning" as a collapse would have catastrophic consequences for Europe, Africa and the Americas. The Atlantic meridional overturning circulation (Amoc) is a major part of the global climate system and was already known to be at its weakest for 1,600 years as a result of the climate crisis. Scientists spotted warning signs of a tipping point in 2021 and know that the Amoc has collapsed in the Earth's past. Climate scientists use dozens of different computer models to assess the future climate. However, for the complex Amoc system, these produce widely varying results, ranging from some that indicate no further slowdown by 2100 to those suggesting a huge deceleration of about 65%, even when carbon emissions from fossil fuel burning are gradually cut to net zero. The research combined real-world ocean observations with the models to determine the most reliable, and this hugely reduced the spread of uncertainty. They found an estimated slowdown of 42% to 58% in 2100, a level almost certain to end in collapse. The Amoc is a major part of the global climate system and brings sun-warmed tropical water to Europe and the Arctic, where it cools and sinks to form a deep return current. A collapse would shift the tropical rainfall belt on which many millions of people rely to grow their food, plunge western Europe into extreme cold winters and summer droughts, and add 50-100cm to already rising sea levels around the Atlantic. The slowdown has to do with the Arctic's rapidly rising temperatures from global warming. "Warmer water is less dense and therefore sinks into the depths more slowly," explains the Guardian. "This slowing allows more rainfall to accumulate in the salty surface waters, also making it less dense, and further slowing the sinking and forming an Amoc feedback loop." The new research has been published in the journal Science Advances.

Read more of this story at Slashdot.

A new Ipsos poll finds Americans are increasingly getting news from online personalities and comedians instead of traditional TV or newspapers. The survey says nearly 70% get news online in a given week, versus 55% from TV and 25% from newspapers, with figures like Joe Rogan, Greg Gutfeld, Sean Hannity, and late-night hosts ranking prominently depending on political leanings. From the Hollywood Reporter: The poll, which was conducted in March, actually found the conservative politicians and cabinet members, including President Trump, were the top news influencers. When politicos were excluded, Joe Rogan led the list, followed by Fox News personalities Greg Gutfeld and Sean Hannity, and then TuckerCarlson and Ben Shapiro. The only three influencers to crack 10 percent were Trump, Rogan, and JD Vance. Among people who voted for Kamala Harris, the top news personalities were late night hosts, led by ABC's Jimmy Kimmel, followed by CBS Late Show host Stephen Colbert, and Daily Show host Jon Stewart. Just under 70 percent of respondents said they get their news online in a given week, compared to 55 percent for TV, and 25 percent for newspapers. [...] Of traditional media outlets, TV dominated, with Fox News, the broadcast networks, and CNN topping the list of sources. Facebook, YouTube and Instagram were the most popular online news sources. "On these platforms opinionated personalities and comedians appear to drown out anyone who would fit in the traditional journalist category," said assistant professor of practice and Jordan Center Executive Director Steven L Herman. "Even in the late 19th century and early 20th centuries, sensationalist and polarizing voices in print and later on air were among the most influential in the political landscape -- such as political satirist Mark Twain and populist Father Charles Coughlin."

Read more of this story at Slashdot.

NIST is narrowing how it handles CVEs in the National Vulnerability Database (NVD), saying it will only automatically enrich higher-priority vulnerabilities. "CVEs that do not meet those criteria will still be listed in the NVD but will not automatically be enriched by NIST," it said. "This change is driven by a surge in CVE submissions, which increased 263% between 2020 and 2025. We don't expect this trend to let up anytime soon." The Hacker News reports: The prioritization criteria outlined by NIST, which went into effect on April 15, 2026, are as follows: - CVEs appearing in the U.S. Cybersecurity and Infrastructure Security Agency's (CISA) Known Exploited Vulnerabilities (KEV) catalog. - CVEs for software used within the federal government. - CVEs for critical software as defined by Executive Order 14028: this includes software that's designed to run with elevated privilege or managed privileges, has privileged access to networking or computing resources, controls access to data or operational technology, and operates outside of normal trust boundaries with elevated access. Any CVE submission that doesn't meet these thresholds will be marked as "Not Scheduled." The idea, NIST said, is to focus on CVEs that have the maximum potential for widespread impact. "While CVEs that do not meet these criteria may have a significant impact on affected systems, they generally do not present the same level of systemic risk as those in the prioritized categories," it added. [...] Changes have also been instituted for various other aspects of the NVD operations. These include: - NIST will no longer routinely provide a separate severity score for a CVE where the CVE Numbering Authority has already provided a severity score. - A modified CVE will be reanalyzed only if it "materially impacts" the enrichment data. Users can request specific CVEs to be reanalyzed by sending an email to the same address listed above. - All unenriched CVEs currently in backlog with an NVD publish date earlier than March 1, 2026, will be moved into the "Not Scheduled" category. This does not apply to CVEs that are already in the KEV catalog. - NIST has updated the CVE status labels and descriptions, as well as the NVD Dashboard, to accurately reflect the status of all CVEs and other statistics in real time.

Read more of this story at Slashdot.

An anonymous reader quotes a report from Wired: Sam Altman's iris-scanning, humanity-verifying World project announced at an event in San Francisco on Friday that Tinder users around the globe can now put a digital badge on their profiles signaling to potential suitors that they're a real human, provided they've already stared into one of World's glossy white Orbs and allowed their eyes to be scanned. The announcement follows a pilot project for Tinder verification that World previously conducted in Japan. [...] In addition to the Tinder global expansion, Tools for Humanity, the company behind World, announced a number of other consumer and enterprise partnerships on Friday at its Lift Off event in San Francisco. The startup says Tinder users who verify with their World ID will receive five free "boosts," typically a paid feature that increases the number of users who see a profile by up to 10 times for 30 minutes. The videoconferencing platform Zoom also says that users can now require other participants to verify their identity with World before joining a call. Docusign, the contract signing software, will allow users to require World's identity verification technology. Tiago Sada, Tools for Humanity's chief product officer, tells WIRED the company sees major platform partnerships as key to helping World become a mainstream identity-verification technology. Sada said he's especially interested in working with social media companies in the future, and was encouraged to see that Reddit has started testing World as a solution to help users distinguish bots from real people. [...] World is also launching a tool called Concert Kit, which lets artists reserve concert tickets for verified humans, a pitch aimed squarely at the bot-driven scalping problem that critics say has plagued sites like TicketMaster. World will test the feature on the upcoming Bruno Mars World Tour featuring Anderson .Paak, who is scheduled to play a verified-humans-only show under his alias DJ Pee .Wee in San Francisco on Friday night. "The idea that World ID is not just private, but it's one of the most private things you've ever used, that's not obvious," says Sada. "We're just not used to this kind of technology. Many people used to tape their [iPhone's sensor used to enable] Face ID when it came out, then we got used to it."

Read more of this story at Slashdot.

BrianFagioli writes: Mozilla's email subsidiary MZLA Technologies just introduced Thunderbolt, an open-source AI client aimed at organizations that want to run AI on their own infrastructure instead of relying entirely on cloud services. The idea is to give companies full control over their data, models, and workflows while still offering things like chat, research tools, automation, and integration with enterprise systems through the Haystack AI framework. Native apps are planned for Windows, macOS, Linux, iOS, and Android. Thunderbolt allows organizations to do the following: - Run AI with their choice of models, from leading commercial providers to open-source and local models - Connect to systems and data: Integrate with pipelines and open protocols, including: deepset's Haystack platform, Model Context Protocol (MCP) servers, and agents with the Agent Client Protocol (ACP) - Automate workflows and recurring tasks: Generate daily briefings, monitor topics, compile reports, or trigger actions based on events and schedules - Work seamlessly across devices with native applications for Windows, macOS, Linux, iOS, and Android - Maintain security with self-hosted deployment, optional end-to-end encryption, and device-level access controls

Read more of this story at Slashdot.

Amazon's newest Fire TV Sticks are dropping support for normal sideloading, blocking apps from outside the Amazon Appstore unless the device is registered with developers. Cord Cutters News reports: This week, Amazon announced the upcoming launch of a new Fire TV Stick HD. The new model will run on Amazon's Vega OS, rather than Android, so most streaming apps will be supported, but users won't be add third party apps. Now, on the product page to preorder the new Fire Stick, some Amazon customers are getting a message warning them that the new model won't allow sideloading. Interestingly, not all customers are getting the message, whether signed in to an Amazon account or not. The message, shown in a screenshot below, says: "For enhanced security, this device prevents sideloading or installing apps from unknown sources. Only apps from the Amazon Appstore are available for download." [...] The Fire TV Stick Select, announced in September 2025, also runs on Vega and some customers will see the same message about sideloading on that product page. [...] While Amazon continues to be a "multi-OS company," we should expect that future Fire TV models will also be built with Vega OS, limiting the apps users can access with their streaming devices to those from the Amazon Appstore.

Read more of this story at Slashdot.

An anonymous reader quotes a report from Ars Technica: On Thursday, OpenAI announced it had developed a large language model specifically trained on common biology workflows. Called GPT-Rosalind after Rosalind Franklin, the model appears to differ from most science-focused models from major tech companies, which have generally taken a more generic approach that works for various fields. In a press briefing, Yunyun Wang, OpenAI's Life Sciences Product Lead, said the system was designed to tackle two major roadblocks faced by current biology researchers. One is the massive datasets created by decades of genome sequencing and protein biochemistry, which can be too much for any one researcher to take in. The second is that biology has many highly specialized subfields, each with its own techniques and jargon. So, for example, a geneticist who finds themselves working on a gene that's active in brain cells might struggle to understand the immense neurobiological literature. Wang said the company had taken an LLM and trained it on 50 of the most common biological workflows, as well as on how to access the major public databases of biological information. Further training has resulted in a system that can suggest likely biological pathways and prioritize potential drug targets. "We're connecting genotype to phenotype through known pathways and regulatory mechanisms, infer likely structural or functional properties of proteins, and really leveraging this mechanistic understanding," Wang said. To address LLMs' tendencies toward sycophancy and overenthusiasm, OpenAI says it has tuned the model to be more skeptical, so it's more likely to tell you when something is a bad drug target. There was a lot of talk about GPT-Rosalind's "reasoning" and "expert-level" abilities. We were told that the former was defined as being able to work through complex, multi-step processes, while the latter was derived from the model's performance on a handful of benchmarks. Access to GPT-Rosalind is currently limited "due to concerns about the model's potential for harmful outputs if asked to do something like optimize a virus's infectivity," notes Ars. Only U.S.-based organizations can request access at the moment.

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Longtime Slashdot reader AmiMoJo writes: Windows has limited FAT32 partitions to a maximum of 32GB for decades now. When memory cards and USB drives exceeded 32GB in size, the only options were exFAT or NTFS. Neither option was well supported on other platforms at first, although exFAT support is fairly widespread now. In their latest blog post, Microsoft announced that the limit for FAT32 partitions is being increased to 2TB. Of course, that doesn't mean that every device that supports FAT32 will work flawlessly with a 2TB partition size, but at least there is a decent chance that older devices with don't support exFAT will now be usable with memory cards over 32GB.

Read more of this story at Slashdot.

Newly unsealed records in California's antitrust case against Amazon allegedly show the company pressured third-party sellers to raise prices on rival sites like Walmart, Target, and Wayfair so Amazon could maintain the appearance of offering the lowest price. California says Amazon used tools like Buy Box suppression to punish cheaper listings elsewhere. The Guardian reports: [...] In one previously redacted deposition, marked "highly confidential," Mayer Handler, owner of a clothing company called Leveret, testified that he received an email in October 2022 from Amazon notifying him that one of his products was "no longer eligible to be a featured offer" through Amazon's Buy Box. The tech giant, he testified, had suppressed the item, a tiger-themed, toddler's pajama set, because his company was selling it for $19.99 on Amazon, a single cent higher than what his company was offering it for on Walmart. Afterwards, Handler testified, his company "changed pricing on Walmart to match or exceed Amazon's price" or changed the item's product code to try to throw off Amazon's price tracking system. In response to a question from the Guardian, Handler criticized Amazon for tracking prices across the internet and "shadow" blocking his company's products -- tactics which he said were depriving consumers of "lower prices." "Maybe that's capitalism," he wrote. "Or that's a monopoly causing price hikes on the consumer." In another unsealed deposition, Terry Esbenshade, a Pennsylvania garden store supplier, testified in October 2024 that whenever his products lost Amazon's Buy Box because of lower prices elsewhere on the internet, his sales on Amazon would plummet by about 80%. This financial reality forced him to try to raise his products' prices with other retailers elsewhere, he said. In one instance, Esbenshade testified, he discovered that one of his company's better-selling patio tables had "become suppressed" on Amazon. Esbenshade wasn't sure why, he recalled, until someone at Amazon suggested he look at Wayfair, another online retailer that happened to be selling his patio table below Amazon's price. The businessman went online and set up a new minimum advertised price for the table on Wayfair to ensure it was higher than Amazon's. "So that raised the price up, and, voila, my product came back" on Amazon, he said, thanks to the reinstatement of the Buy Box.

Read more of this story at Slashdot.

Runtime security has moved from ''nice to have'' to an operational baseline in Linux environments. Most teams learned the hard way that logs and post-event alerts don't catch what actually runs on the system in real time. Attackers don't wait for indexing pipelines or SIEM correlation.