I feel, better to have libglvnd as "default" libGL provider, used to build all software (it have fewer dependencies, than mesa-nonglu, so will be build faster and earlier, so more packages would be built on CI).

Real backend can still be dispatched via /run/opengl-driver symlink. (Backend can be buildEnv of libglvnd enabled mesa and other libglvnd capable implementations. In worst cases user can force real libGL from any non-glvnd compatible package, including old-style mesa builds).

@avnik

I feel, better to have libglvnd as "default" libGL provider, used to build all software (it have fewer dependencies, than mesa-nonglu, so will be build faster and earlier, so more packages would be built on CI).

We discussed this on IRC already:

vcunat: ... but it's difficult to find time for larger changes (or more risky ones).
gchristensen: it still requires holistic thinking about how it interacts with the rest of the systems

So not now, sorry. The next step is also drop that LD_LIBRARY_PATH=/run/opengl-driver/lib hack, once all drivers are ready to by picked by libglvnd.

I'm definitely interested in replacing direct mesa references everywhere. With that in mind I started testing this.

I've applied this patch and done the full rebuild of a Plasma 5 desktop:

• (merge) coreyoconnor@1971460
• (xserver and gl config for desktop) https://github.com/coreyoconnor/nix_configs/blob/master/computers/grr/configuration.nix#L100

xserver starts, and reports the expected GLX, but Plasma 5 does not:

Jan 29 09:39:09 grr xsession[29061]: Could not initialize GLX
Jan 29 09:39:09 grr xsession[29061]: CreateNotify: 12582915
Jan 29 09:39:09 grr xsession[29061]: libGL error: unable to load driver: swrast_dri.so
Jan 29 09:39:09 grr xsession[29061]: libGL error: failed to load driver: swrast

I think I've seen that error before but can't recall what the fix was. That said, the Plasma 5 desktop was working (with HW opengl) prior to this patch and enable of GLVND.

Note this config does not use primus.

Checking the /var/run/opengl-driver/lib directory: NVidia libs are present but no libGL.so.

I think the issue with NVidia with glvnd but no optimus is related to this logic here:

• 71ede8a#diff-eba4fea93f8708e0012684b9c398b1e3R74

I was able to restore OpenGL by applying this hack of a patch:

• coreyoconnor@07b037e

@avnik Unfortunately I'm not in position to implement that, but I would like to be a tester 😃 And we need someone from NixOS team with interest to support and approve that change.

@coreyoconnor Fixed, thank you!

@gnidorah Thanks! No issues with current commits.