> *I think* you can just edit mesa3d PKGBUILD ? And then run makepkg ... never tried Arch packaging but it *supposed* to be simple enough ;))

The mesa pkgbuild is here:
https://gitlab.archlinux.org/archlinux/packaging/packages/mesa/-/blob/main/PKGBUILD?ref_type=heads
Unfortunately I am so incompetent that I don't know how to work with
pkgbuild. I tried to comment out the 2 “libglvnd” entries but when I
compile it crashes with a signature validation error (unknow public
key).

> hm, I thought dri3 by itself is default for xf86-video- amdgpu driver? But may be you use modesetting? Try to look in X.org.log to see what driver actually drive your card? And change it from -modesetting to -amdgpu or other way around?

Yes, amdgpu uses DRI3 in Arch and no, you cannot use nomodeset

with
amd because it would not work (not having nomodeset is a requirement
to install amdgpu drivers).
With your last suggestion the errors with dri3 disappear but the
X1-OpenGL error remains, which continues to fail.


glxinfo works, as does glmark2 and every program that uses opengl. I
only have the problem with CinGG.