[Bug 1965563] Re: GNOME apps crash with "Protocol error" in NVIDIA Wayland sessions

[Alessandro Astone]

> > A possible regression would be that the driver starts reporting as
incompatible on NVIDIA single-GPU systems too. One would notice by all
wayland-native applications suddenly being very slow. Note that such
systems would not default to Wayland in Jammy.

> Please add to the Test Plan to verify this scenario.

I didn't do so originally because NVIDIA on Wayland is not a suggested
nor well supported path in Jammy. Verifying this would mean running a
non-default configuration. But the SRU template instructs you to think
about all possible side-effects, and this is the only one that came to
mind.

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https://bugs.launchpad.net/bugs/1965563

Title:
  GNOME apps crash with "Protocol error" in NVIDIA Wayland sessions

Status in NVIDIA / egl-wayland:
  Fix Released
Status in GTK+:
  Fix Released
Status in egl-wayland package in Ubuntu:
  Fix Released
Status in egl-wayland source package in Jammy:
  In Progress

Bug description:
  [ Impact ]

   * GTK applications fail to start on a hybrid graphics machine with an
  NVIDIA discrete GPU.

   * The NVIDIA egl-wayland extension 1.1.9 only supports rendering to
  the NVIDIA GPU if it is the primary GPU. On a hybrid system the
  primary GPU would be the integrated graphics, while the NVIDIA GPU
  should only be used for offloading of specific applications. On such a
  setup, the egl-wayland extension still incorrectly advertised the
  driver as compatible and attempted to use the NVIDIA GPU for all EGL
  applications.

   * To fix the issue, backport a commit from a newer version of the
  NVIDIA egl-wayland extension that reports the driver as incompatible
  when the NVIDIA GPU is not the primary GPU. This effectively ensures
  that all EGL applications run on integrated graphics by default.

  [ Test Plan ]

   * Set up a hybrid graphics machine with Jammy 22.04 LTS and the
  proprietary NVIDIA drivers 535 or 550.

   * Install `libnvidia-egl-wayland1` from the update.

   * Log-in to a Wayland desktop session.

   * Verify that you can start `gnome-text-editor`.

  [ Where problems could occur ]

   * The scope of the change is limited to the NVIDIA proprietary
  drivers.

   * A possible regression would be that the driver starts reporting as
  incompatible on NVIDIA single-GPU systems too. One would notice by all
  wayland-native applications suddenly being very slow. Note that such
  systems would not default to Wayland in Jammy.

  [ Original Report ]

  $ dpkg-query -W gnome-shell-extension-prefs
  gnome-shell-extension-prefs	42~beta-1ubuntu3
  $ gnome-extensions-app
  Gdk-Message: 17:54:19.697: Error reading events from display: Protocol error

  Caveat: I currently have a mix of packages from jammy-release and
  jammy-proposed.

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