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Kernel: Bootlin, Mediatek, XWayland, and More

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Linux
  • Embedded Linux Boot time optimization: training and webinar

    Bootlin has been helping its customers optimize the boot time of embedded Linux systems for many years, ensuring that these systems meet their startup time requirements. Thanks to this, Bootlin has accumulated a significant experience in this field.

  • Mediatek Posts 8k Lines Of New Linux Kernel Driver Code For AI Processing Unit Support - Phoronix

    For a number of months Mediatek engineers have been posting some Linux kernel driver code for bringing up the AI Processing Unit (APU) within the MT8192 SoC while out this weekend is the complete patch series at more than eight thousand lines of code.

    There has been some APU power handling and IOMMU patches previously posted while on Saturday was the complete set of patches for bringing up the MT8192 APU with power control, tinysys controller (a micro-controller on the APU), and middleware support. In total it's 8.1k lines of new kernel code.

  • xwayland 21.1.2.901
    This is a release candidate for Xwayland 21.1.3.
    
    Most notable change is a fix for the GBM backend to work with the
    Nvidia driver series 495.
    
    Unless any major issues turn up, I'm planning to make the final release
    in the coming weeks.
    
    James Jones (1):
           Use EGL_LINUX_DMA_BUF_EXT to create GBM bo EGLImages
    
    Olivier Fourdan (5):
           xwayland/shm: Avoid integer overflow on large pixmaps
           xwayland: Set GLVND driver based on GBM backend name
           xwayland: Clear tablet cursor pending frame cb
           xwayland/test: Don't catch errors in run-piglit.sh
           Bump version to 21.1.2.901
    
    Povilas Kanapickas (1):
           glamor: Fix handling of 1-bit pixmaps
    
    Simon Ser (1):
           xwayland: fix xdg_output leak
    
    git tag: xwayland-21.1.2.901
    
  • XWayland 21.1.3 Nears With Support For NVIDIA 495 Driver's GBM - Phoronix

    The release candidate to XWayland 21.1.3 is out today with just a few changes but made significant by support for the NVIDIA 495 series driver GBM code path.

    XWayland 21.1.3 is the next point release to this code that is spun out from the upstream X.Org Server for delivering standalone XWayland releases separate from tagged xorg-server versions. XWayland 21.3. has only a handful of fixes like an XDG_Output memory leak fix, fixed handling of 1-bit pixmaps in GLAMOR, avoiding possible integer overflows on large pixmaps, and other maintenance items.

  • Vulkanised Fall 2021 Material Available - Autodesk Has Begun Using MoltenVK - Phoronix

    Last week was the virtual Vulkanised Fall 2021 event hosted by The Khronos Group. The two-day event was focused on all things Vulkan and for those that missed it all of the slide decks and other material are now available.

    This was a two-day virtual affair focused on the high performance graphics and compute API featuring a current status update around features like ray-tracing and video encode/decode, interesting usages of Vulkan, and related work like Arm's astcenc encoder, HLSL shader compilation, and more.

More in Tux Machines

Audiocasts/Shows: Late Night Linux, Destination Linux, and More

Kernel: Slowdown, CephFS, and FS-Cache / CacheFiles

  • How a performance boost in Linux kernel for one family of Intel chips slowed its latest Alder Lake processors

    The mixture of performance and efficiency CPUs in Intel’s 12th-gen Core processors, code-named Alder Lake, hasn’t just been causing problems for some Windows gamers – it almost led to complications for Linux. Phoronix’s Michael Larabel noticed a performance hit in the kernel a fortnight ago – in a work-in-progress release candidate, we should stress – and a fix for the scheduling code landed a little later. It turned out the kernel suffered on Alder Lake chips due to a performance-enhancing tweak for another Intel processor family: the multiple-Atom-core-based Jacobsville. This year, Intel officially canned its Lakefield chips. These consisted of a performance core called Sunny Cove as well as Atom-class efficiency cores dubbed Tremont. Crucially, there are still multi-Tremont-core embedded processors out there, such as Snow Ridge. These are server and infrastructure-oriented components with up to 24 cores. The first proposed cut of kernel 5.16, specifically 5.16-rc1, contained a revision to the scheduler that makes it aware that some clusters of cores share a block of L2 cache – as seen in Snow Ridge and Jacobsville.

  • Testing the Linux Kernel CephFS Client with xfstests

    I do a lot of testing with the kernel cephfs client these days, and have had a number of people ask about how I test it. For now, I’ll gloss over the cluster setup since there are other tutorials for that.

  • Major Rewrite Of Linux's FS-Cache / CacheFiles So It's Smaller & Simpler - Phoronix

    As part of David Howells of Red Hat long-term work on improving the caching code used by network file-systems, he today posted a big patch series rewriting the fscache and cachefiles code as the latest significant step on that adventure. Howells posted a set of 64 patches for rewriting the kernel's fscache and cachefiles code. Linux's fsache is a general purpose cache used by network file-systems while cachefiles is for providing a caching back-end for mounted local file-systems. The Red Hat engineer has been working on this rewrite for more than the past year.

Ubuntu Weekly Newsletter and Ubuntu Desktop on Google Clown

  • Ubuntu Weekly Newsletter Issue 711

    Welcome to the Ubuntu Weekly Newsletter, Issue 711 for the week of November 21 – 27, 2021. The full version of this issue is available here.

  • Launch Ubuntu Desktop on Google Cloud

    This tutorial shows you how to set up a Ubuntu Desktop on Google Cloud. If you need a graphic interface to your virtual desktop on the cloud, this tutorial will teach you how to set up a desktop environment just like what you can get on your own computer.

Open Hardware/Modding: ESP32, 3-D Printing, Raspberry Pi Pico, PocketBeagle

  • Wireless thermal printer kit features M5Stack ATOM Lite controller - CNX Software

    This is certainly not the first ESP32 thermal printer solution, as there are various implementations including bitbank2 thermal printer Arduino connecting ESP32 and nRF52 boards to the printer over Bluetotoh LE, or a Arduino sketches to print bitmaps over serial or MQTT.

  • Generate Fully Parametric, 3D-Printable Speaker Enclosures | Hackaday

    Having the right speaker enclosure can make a big difference to sound quality, so it’s no surprise that customizable ones are a common project for those who treat sound seriously. In that vein, [zx82net]’s Universal Speaker Box aims to give one everything they need to craft the perfect enclosure.

  • Z80 Video Output Via The Raspberry Pi Pico | Hackaday

    Building basic computers from the ground up is a popular pastime in the hacker community. [Kevin] is one such enthusiast, and decided to whip up a video interface for his retro Z80 machine.

  • The Calculator Charm: Calculatorium Leviosa! | Hackaday

    Have you ever tried waving your hand around like a magic wand and summoning a calculator? We would guess not since you’d probably look a little silly doing so. That is unless you had [Andrei’s] cool gesture-controlled calculator. [Andrei] thought it would be helpful to use a calculator in his research lab without having to take his gloves off and the results are pretty cool. His hardware consists of a PocketBeagle, an OLED, and an MPU6050 inertial measurement unit for capturing his hand motions using an accelerometer and gyroscope. The hardware is pretty straightforward, so the beauty of this project lies in its machine learning implementation.