https://bugs.freedesktop.org/show_bug.cgi?id=103791
--- Comment #18 from Anthony Parsons flussence+bz.fdo@gmail.com --- Hi, I'm seeing the same problem on an RX550 (polaris12). Running xrandr doesn't seem to work as a workaround but flipping VTs does. Would having the debug output for this one be useful, or was the other log enough?
kernel 4.14.5-zen+ xorg 1.19.5 xf86-video-amdgpu 1.4.0 libdrm 2.4.88