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Kernel: Intel, Lenovo, and AMD

Submitted by Roy Schestowitz on Friday 31st of December 2021 10:10:44 PM Filed under
Linux
  • Intel Alder Lake's Thread Director Support Coming to Linux | Tom's Hardware

    Intel has published a new patch series for its Linux drivers that promise to improve the performance of its hybrid Alder Lake processors by optimizing usage of (P)erformance and (E)fficiency cores.

    When Intel released its 12th Generation Core 'Alder Lake' processors earlier this year, it quickly turned out that the new CPUs perform better under Windows rather than under Linux. Unlike Windows 11, Linux does not have proper support for Intel's Thread Director technology based on the Enhanced Hardware Feedback Interface (HFI), which enables the OS to utilize high-performance Golden Cove and energy-efficient Gracemont cores properly.

    At present, the Linux kernel decides when to use P or E cores using the ITMT/Turbo Boost Max 3.0 driver that relies on the information exposed by the firmware, reports Phoronix. Essentially, this means that under Linux, the OS in many cases prefers the fastest cores (i.e., Golden Coves at high clocks) and underutilizes energy-efficient cores.

  • ThinkPad ACPI Driver Picking Up New Features With Linux 5.17 - Phoronix

    For those running Linux on Lenovo ThinkPad laptops, the upcoming Linux 5.17 cycle is set to bring a few improvements to the "thinkpad_acpi" driver.

    Thanks to developers Ognjen Galic and Thomas Weißschuh, the ThinkPad ACPI driver is adding support for inhibit charge behavior if wanting to temporarily disable charging support for ThinkPads allowing this behavior through the system's embedded controller (EC).

    Similarly, there is also now force discharge support if wanting to force the battery to change and again contingent upon EC support from the ThinkPad.

  • Mesa's Radeon Vulkan Driver Lands Experimental Mesh Shaders - Phoronix

    Thanks to Valve engineer Timur Kristóf and other open-source developers involved, Mesa's Radeon Vulkan driver "RADV" is ending 2021 on a high note: mesh shaders was just merged!

    As noted back in October, RADV has been working on mesh shaders at least in experimental form and making use of NVIDIA's NV_mesh_shader extension.

    Mesh shaders provide a compute-like shader stage to replace the conventional vertex/geometry pipeline. This work though is expected to remain "experimental" until there is a proper Vulkan cross-vendor extension around mesh shaders as NV_mesh_shader is known to perform poorly on AMD hardware for which the extension was not designed.

    Mesh shaders support requires Radeon RX 6000 "RDNA2" GPUs and newer for support. This experimental mesh shaders support will be part of Mesa 22.0 that will debut as stable by March. This may prove beneficial for VKD3D-Proton in mapping Direct3D 12 mesh shaders atop Vulkan but, again, the performance isn't expected to be optimal.

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