Nvidia driver installed but X apps are using software rendering (LLVMpipe) in Wayland sessions

[Daniel van Vugt]

Nvidia driver installed but X apps are using software rendering (LLVMpipe) in Wayland sessions.

I am using kernel parameter nvidia-drm.modeset=1, which is required to get the "Ubuntu on Wayland" option. But after logging in I see:

$ glxinfo | grep OpenGL
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: llvmpipe (LLVM 8.0, 256 bits)
OpenGL core profile version string: 3.3 (Core Profile) Mesa 19.0.1
OpenGL core profile shading language version string: 3.30
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.1 Mesa 19.0.1
OpenGL shading language version string: 1.40
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.0 Mesa 19.0.1
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.00
OpenGL ES profile extensions:

$ es2_info | grep ^GL
GL_VERSION: OpenGL ES 3.0 Mesa 19.0.1
GL_RENDERER: llvmpipe (LLVM 8.0, 256 bits)

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: nvidia-driver-418 418.56-0ubuntu1
ProcVersionSignature: Ubuntu 5.0.0-8.9-generic 5.0.1
Uname: Linux 5.0.0-8-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.10-0ubuntu25
Architecture: amd64
Date: Sun Apr 7 17:26:07 2019
InstallationDate: Installed on 2018-12-04 (124 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20181203)
SourcePackage: nvidia-graphics-drivers-418
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Daniel van Vugt (vanvugt)]

Added a xorg-server task, because I recall that needed rebuilding with EGLStreams support enabled in Xwayland. Maybe that's the only problem here?

[Daniel van Vugt (vanvugt)]

Rebuilding xorg-server with --enable-xwayland-eglstream didn't help (!?)

[Nico Jakob (nicoj10)]

Is there anything one can do to help resolving this issue?

[Daniel van Vugt (vanvugt)]

Apparently the feature doesn't exist in Xwayland yet. Someone mentioned that it's a known issue and the upstream developers will be looking at completing it this year.

[Nico Jakob (nicoj10)]

Is there any update on this?

[Daniel van Vugt (vanvugt)]

Someone probably needs to find a relevant upstream Xorg bug link to see where/if it is being discussed there.

This is not the place where Xorg developers discuss such things.

[Bryan Quigley (bryanquigley)]

Couldn't find a bug, but it's described as a known issue here: https://blogs.gnome.org/uraeus/2019/04/03/preparing-for-fedora-workstation-30/

Given the description above it seems to be waiting on a new nvidia driver - still an issue on 430.14.

[Daniel van Vugt (vanvugt)]

Proposed fix/hack:

https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6429

[Daniel van Vugt (vanvugt)]

The bug is still present in 21.04 but a new fix has been proposed in: https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/587

[Daniel van Vugt (vanvugt)]

Fix landed in Xorg 1.21: https://cgit.freedesktop.org/xorg/xserver/commit/?id=38e875904b039ec1889e7c81eb1d577a4f69b26d&utm_source=anzwix

But it's not yet in the separate Xwayland branch *and* it supposedly requires Nvidia driver 470. So we're probably waiting for Ubuntu 21.10.

[Daniel van Vugt (vanvugt)]

This also appears to be relevant/needed: https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/673

[Daniel van Vugt (vanvugt)]

Fix released in xwayland 21.1.1.901 (which is a release candidate for the aforementioned 21.1.2)

[Daniel van Vugt (vanvugt)]

Looks like xorg-server will get the fix in "21" instead of "1.21". Although that's probably not really important to anyone here because Ubuntu switched to using the separate 'xwayland' package in impish which already has the fix.

It might be relevant to focal HWE in future though. Maybe Ubuntu 20.04.5?