https://bugs.freedesktop.org/show_bug.cgi?id=104492
--- Comment #3 from florian.will@googlemail.com --- Hi Ilia,
unfortunately updating to 17.4~git1801031930.ad2187~oibaf~a (apparently a Jan 3 commit) did not fix this test case. I'll downgrade again because that package breaks renderdoc and the gnome login screen (wayland-based) on my system, probably packaging-related.