[Bisected] libglvnd fails to automatically detect glx vendor.
After Gentoo turned on libglvnd support per default, I noticed that Xorg applications would fail to create GLX contexts when using Xwayland (sway wm, haven't tried other wayland compositors).
It did work when I forced a vendor with
__GLX_VENDOR_LIBRARY_NAME=mesa or when using xorg-server-1.20.8.
So I started bisecting and it seems like 84692415 is the commit that break this for me.
Before this commit I can run
glxinfo and it works out of the box. But with this commit I get:
name of display: :0 Error: couldn't find RGB GLX visual or fbconfig
Using strace it seems like it can't figure out that my GLX_VENDOR is mesa and it tries to load
/usr/lib64/libGLX_indirect.so.0 instead (which I don't have and it then exits).
If I do not use libglvnd, it also works. But that just side steps this issue.