debcrafters-packages team mailing list archive

[Tony Hsiao <2124220@xxxxxxxxxxxxxxxxxx>]

Thank you for your feedback and for highlighting the ongoing issues with
NVIDIA driver support on Wayland in 24.04.

To clarify, the proposed changes to gdm3 and systemd-hwe-hwdb are
designed to only affect specific OEM platforms—currently, those with
AMD+NVIDIA hybrid graphics—by using targeted hwdb entries. This does not
enable Wayland by default for all NVIDIA systems in 24.04, but rather
allows OEMs to opt-in for select hardware where we have verified that
Wayland resolves critical issues (such as incorrect GPU selection and
Energy Star certification blockers).

On these platforms, the AMD iGPU is correctly selected as the primary
GPU under Wayland, and the known Xorg bugs are avoided. Other systems,
including general NVIDIA-only platforms, will remain on Xorg by default.

Branch with the proposed commit:
https://git.launchpad.net/~snalvc/+git/gdm3/tree/?h=prefer-wayland

** Summary changed:

- [DRAFT][SRU] Prefer Wayland on OEM AMD+NVIDIA platforms
+ [SRU] Prefer Wayland on OEM AMD+NVIDIA platforms

-- 
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https://bugs.launchpad.net/bugs/2124220

Title:
  [SRU] Prefer Wayland on OEM AMD+NVIDIA platforms

Status in OEM Priority Project:
  New
Status in gdm3 package in Ubuntu:
  New
Status in systemd-hwe package in Ubuntu:
  New

Bug description:
  [ Impact ]

   * On some platforms with AMD integrated and NVIDIA discrete GPUs, the NVIDIA
   dGPU is incorrectly selected as the primary device, leading to issues such as
   [1][2]. This also causes glxgears to run on the dGPU instead of the iGPU,
   blocking Energy Star certification. These problems are mitigated or resolved
   when using Wayland. The OEM team has adopted this solution to prefer Wayland
   on affected AMD+NVIDIA platforms and proposes this SRU to address the OEM gap.

   * The update introduces new hwdb entries and udev rules in systemd-hwe-hwdb
   to set a property for affected systems. gdm3 is updated to prefer Wayland
   when this property is present, allowing OEMs to target specific hardware
   for Wayland by default and avoid these bugs.

  [ Test Plan ]

   * On a listed AMD+NVIDIA system, install the update and reboot. Confirm
   Wayland is selected (`echo $XDG_SESSION_TYPE` returns wayland). Verify the
   AMD iGPU is selected as the renderer with command `glxinfo -B`.

   * On other systems, confirm that display server selection is
  unchanged.

  [ Where problems could occur ]

   * If the rules match too broadly, Wayland may be selected on unsupported
   hardware.

   * If the rules miss affected platforms, the bug will persist. Display server
   selection logic could regress on hybrid graphics systems.

  [ Other Info ]

   * [1] AMD platform built-in display is not selected as primary GPU in Xorg
   session: https://gitlab.freedesktop.org/xorg/lib/libpciaccess/-/issues/23

   * [2] “PRIME Profiles” option disappears
   in nvidia-settings on AMD + Nvidia platforms:
   https://github.com/canonical/ubuntu-drivers-common/issues/123

   * Only platforms listed in hwdb are affected; others remain unchanged. The
   mechanism is extensible for future OEM needs.

   * This SRU targets only noble, as OEM certification for these platforms
   begins with noble, and future releases already default to Wayland.

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