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[Daniel van Vugt <2124220@xxxxxxxxxxxxxxxxxx>]

That said, using Wayland is probably fine in most cases on hybrid
machines because AMD is the primary GPU and Wayland support is mature
for AMD. It only becomes a performance problem when someone plugs a
monitor into the Nvidia GPU (usually the HDMI port). The workaround we
recommend is for people to avoid using HDMI ports on hybrid laptops and
use USB-C adapters for external monitors instead. But I really don't
want someone coming asking if bug 2081140 can be fixed on Noble in
future because the answer is likely no. We only guarantee that Nvidia
support for Wayland is *finished* in 26.04 and later.

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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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