debcrafters-packages team mailing list archive

[Alessandro Astone <2124220@xxxxxxxxxxxxxxxxxx>]

When Ubuntu 24.04 was released, the intent was for hybrid laptops to default to Wayland.
There was a bug which actually made Xorg vs Wayland on hybrid laptops a race condition, and when fixing that we re-evaluated whether we really wanted Xorg or Wayland to be the default for hybrid laptops. See bug 2080498.
It was the input of Canonical OEM Team that ultimately made us settle on Xorg for hybrid laptops, so I'm surprised to now see this proposal.

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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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