Re: F36 Change: Wayland By Default with NVIDIA proprietary Driver (System-Wide Change)

[Julian Sikorski]

Am 07.12.21 um 15:45 schrieb Ben Cotton:
>  https://fedoraproject.org/wiki/Changes/WaylandByDefaultOnNVIDIA
>  
>  == Summary ==
>  Enable Wayland sessions by default in GDM even with the NVIDIA
>  proprietary driver.
>  
>  == Owner ==
>  * Name: [[User:ofourdan| Olivier Fourdan]]
>  * Email: <ofourdan(a)redhat.com&gt;
>  
>  
>  == Detailed Description ==
>  Recent updates in NVIDIA proprietary driver allow Xwayland to benefit
>  from hardware acceleration and X11 applications can have their
>  rendering hardware accelerated.
>  
>  That allowed to enable Wayland sessions even when the NVIDIA
>  proprietary driver is used, but keeping Xorg the default in that case.
>  
>  This proposal is to make Wayland by default with newer versions of the
>  NVIDIA proprietary driver to remain consistent with other drivers.
>  
>  GDM already has a set of udev rules which check for the driver and its
>  version, so this would only require a tweak in the udev rules to make
>  Wayland session the default with the next version of the NVIDIA driver
>  [https://gitlab.gnome.org/GNOME/gdm/-/blob/main/data/61-gdm.rules.in].
>  
>  Note that currently Xorg is also preferred in the case of multiple
>  GPU, this would remain the case with this proposal.
>  
>  This change is just about changing the default with NVIDIA proprietary
>  driver on supported configurations, “GNOME on Xorg” still remains an
>  option, just like with other drivers.
>  
>  
>  == Benefit to Fedora ==
>  Fedora has changed to Wayland by default since [[Changes/Login Screen
>  Over Wayland|Fedora 22]], but the NVIDIA proprietary driver has been
>  an exception ever since (either because originally Wayland would be
>  disabled with NVIDIA drivers, or more recently Xorg would be used by
>  default).
>  
>  Currently, when first installing Fedora on NVIDIA hardware, users get
>  Wayland by default with the Open Source "nouveau" driver, with Xorg
>  being an option in the login screen. If they later decide to enable
>  the rpmfusion repository and install the NVIDIA proprietary driver,
>  they get Xorg by default and Wayland as an option.
>  
>  This change would make the default consistent regardless of the
>  driver, for single GPU systems.
>  
>  == Scope ==
>  * Proposal owners: Tweak the gdm udev rule to enable Wayland with the
>  NVIDIA proprietary driver above a given version
>  [https://gitlab.gnome.org/GNOME/gdm/-/blob/main/data/61-gdm.rules.in#L7-17]
>  * Other developers: [[User:Rstrode| Ray Strode]] for reviewing the
>  changes in the udev rules from GDM
>  * Release engineering: This change doesn't affect release workflow
>  * Policies and guidelines: This change doesn't affect packaging guidelines
>  * Trademark approval: N/A (not needed for this Change)
>  * Alignment with Objectives: No
>  
>  
>  == Upgrade/compatibility impact ==
>  
>  
>  == How To Test ==
>  # Requires an NVIDIA GPU supported by the recent NVIDIA proprietary
>  driver and `nvidia-drm.modeset=1` set in the kernel command line to
>  enable KMS [http://us.download.nvidia.com/XFree86/Linux-x86_64/495.44/README/kms.html]
>  (rpmfusion packages for the NVIDIA driver do that automatically)
>  # Enable the rpmfusion “nonfree” repository to install the NVIDIA
>  graphics drivers
>  [https://docs.fedoraproject.org/en-US/quick-docs/setup_rpmfusion/]
>  # Install the NVIDIA proprietary driver (and the
>  `xorg-x11-drv-nvidia-power` package for suspend/resume support - see
>  [https://rpmfusion.org/Howto/NVIDIA?highlight=%28%5CbCategoryHowto%5Cb%29#...]
>  and
> [http://us.download.nvidia.com/XFree86/Linux-x86_64/495.44/README/powerman...]
>  for more details) from the rpmfusion repository
>  # Reboot the machine
>  # Ensure graphical login screen comes up
>  # Try to log into a "GNOME" session
>  # Check whether this is a "GNOME on Wayland" session (both `$DISPLAY`
>  and `$WAYLAND_DISPLAY` are set)
>  # Log out
>  # Try to log into a "GNOME on Xorg" session
>  # Check whether this is a "GNOME on Xorg" session (`$DISPLAY` is set,
>  `$WAYLAND_DISPLAY` is not set)
>  
>  
>  == User Experience ==
>  Users with NVIDIA hardware and NVIDIA proprietary driver installed
>  will get a Wayland session by default when selecting the "GNOME"
>  session in the login screen.
>  
>  
>  == Dependencies ==
>  This depends on the NVIDIA proprietary driver and its support for Wayland.
>  
>  Typically, this proposal would change the default in a future version
>  of the NVIDIA driver which is not released yet.
>  
>  
>  == Contingency Plan ==
>  * Contingency mechanism: Revert the default to Xorg for NVIDIA driver
>  by reverting the changes in the udev rule shipping with GDM
>  * Contingency deadline: Beta Freeze
>  * Blocks release? No
>  
>  == Documentation ==
>  NVIDIA's own documentation
>  [http://us.download.nvidia.com/XFree86/Linux-x86_64/495.44/README/]:
>  
>    * http://us.download.nvidia.com/XFree86/Linux-x86_64/495.44/README/kms.html
>    * http://us.download.nvidia.com/XFree86/Linux-x86_64/495.44/README/xwayland...
>    * http://us.download.nvidia.com/XFree86/Linux-x86_64/495.44/README/gbm.html
>   
Night light does not work with NVIDIA running Wayland:
- https://gitlab.gnome.org/GNOME/mutter/-/issues/290
- 
https://forums.developer.nvidia.com/t/gnome-night-light-not-working-under...
Until this is fixed, I do not think Wayland should be the default.

Best regards,
Julian