(In reply to roland@rptd.ch from comment #30) > How I best test this? Just check out the branch and build it or apply it > somehow to the mesa branch I have here from bisecting? wget 'https://gitlab.freedesktop.org/mesa/mesa/merge_requests/1852.patch' and store it in /etc/portage/patches/media-libs/mesa/ Then just rebuild (with portage) a version of Mesa that is known to have the bug.