https://bugs.freedesktop.org/show_bug.cgi?id=109628
--- Comment #33 from Chris Snook chris.snook@gmail.com --- (In reply to Johannes Hirte from comment #28)
From the reports, it seems to be compositor related. For me, kwin with OpenGL 3.1 backend works fine. xfwm4 seems to trigger the bug, maybe other compositors too.
Confirmed that the workaround of switching to the kwin OpenGL 3.1 compositor works for me.
kernel: 5.3.0-19-generic (Ubuntu 19.10) window manager: kwin-x11 4:5.16.5-0ubuntu1 CPU: Ryzen Pro 2500U machine: Lenovo Thinkpad A485 X server: xserver-xorg 1:7.7+19ubuntu12 userspace driver: xserver-xorg-video-amdgpu 19.0.1-1ubuntu1
I'm happy to test patches or reproduce.