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Brendan Gould avatar Ubuntu

Add -eglstream to Xwayland

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Brendan Gould

I am trying to get a Wayland session running with as few bugs as possible using the nvidia proprietary drivers (I am aware this is a tall order). Things seem to be working mostly perfectly for me, with the exception of apps running in Xwayland. In particular, these apps stutter / display previously rendered frames (particularly when typing). This is a known bug, and tracked at https://gitlab.freedesktop.org/xorg/xserver/-/issues/1317.

For chromium apps, I have noticed that adding --use-gl=egl as a command line argument nearly completely fixes this issue. However, not all Xwayland apps support this argument, so I cannot simply add it to everything that causes problems.

From the help page for Xwayland, I learned about the option -eglstream, which encourages Xwayland to "use eglstream backend for nvidia GPUs". This sounds like exactly what I want. My problem is that I have not found any way to pass the -eglstream argument to the default Xwayland instance used on the wayland session of Gnome.

Immediately after a fresh login, ps aux | grep Xwayland shows that Xwayland is not running yet. If I then start an app that runs through Xwayland, I see a process:

/usr/bin/Xwayland :1 -rootless -noreset -accessx -core -auth /run/user/1000/.mutter-Xwaylandauth.0GRD41 -listen 4 -listen 5 -displayfd 6 -initfd 7

The parent process ID points towards gnome-shell, leading me to believe that this is what is responsible for auto-starting Xwayland.

If I try to run my own Xwayland instance with the new arg, I get the following:

$ /usr/bin/Xwayland :1 -rootless -eglstream -noreset -accessx -core -auth /run/user/1000/.mutter-Xwaylandauth.0GRD41 -listen 4 -listen 5 -displayfd 6 -initfd 7
(WW) Option "-listen" for file descriptors is deprecated
Please use "-listenfd" instead.
(WW) Option "-listen" for file descriptors is deprecated
Please use "-listenfd" instead.
Failed to initialize glamor, falling back to sw
(EE) 
Fatal server error:
(EE) Cannot write display number to fd 6
(EE) 
Aborted (core dumped)

I get the same output whether I run the above command before Xwayland has been autostarted (i.e. just after a fresh login, before running any apps) or after, with the other instance already running.

Is there a way to configure gnome-shell to add the argument I want? Or perhaps to replace a running instance of Xwayland?

Specs:

  • Ubuntu 22.04.2
  • NVIDIA RTX 3050 using the nvidia-driver-530-open drivers
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Brendan Gould avatar Ubuntu
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Brendan Gould

I was wrong before, it is not gnome-shell that autostarts Xwayland, but rather mutter. I was able to add the -eglstream argument by patching the source and compiling myself. To do this, I followed the script at https://github.com/yilozt/mutter-rounded/blob/main/ubuntu/package.sh (instead of applying the patches in the repo, I just manually edited the file).

It did stop the flickering, but at a very steep performance cost. The effect was almost identical to setting XWAYLAND_NO_GLAMOR or MUTTER_DEBUG_FORCE_EGL_STREAM=1 as recommended by https://gitlab.freedesktop.org/xorg/xserver/-/issues/1317. I suspect the latter of these two may even be doing exactly the same thing.

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