https://bugs.freedesktop.org/show_bug.cgi?id=111122
--- Comment #12 from Pierre-Eric Pelloux-Prayer pierre-eric.pelloux-prayer@amd.com --- (In reply to Brian Schott from comment #10)
Just rebuilt mesa, libdrm, and xf86-video-amdgpu from git this evening. The kernel is the gentoo patched version of 5.2.6. The problem is not limited to XFCE's window manager. This is what it looks like in Dolphin: https://i.imgur.com/b8VLVP6.png
Does using "AMD_DEBUG=nodcc" Mesa environment variable help?
Could you capture an apitrace of the issue in Dolphin so I can reproduce more easily?