Freezes when waking up after screen goes blank.
Submitted by Julio
Assigned to Default DRI bug account
Created attachment 142769
Similar to bug 105018, but instead of kernel panic, system freezes for some time after waking screen up.
Tested on ArchLinux, it can be reproduced on Linux 4.18 and 4.19, using an AMD RX550.
It always happens when using DPMS/Screen blanking, after leaving the screen blank for some minutes and waking it up.
It keeps freezing for some time, sometimes for seconds others for minutes.
The attached dmesg output is similar to bug 105018.
Every time the system is frozen, those 2 lines are shown:
"[drm:dm_crtc_get_scanoutpos [amdgpu]] ERROR dc_stream_state is NULL for crtc '1'!
[ 1701.356720] [drm:dm_vblank_get_counter [amdgpu]] ERROR dc_stream_state is NULL for crtc '1'!"
Tried removing xf86-video-amdgpu (DDX Driver), and while the freezes disappear, it takes longer to wake up the screen and dmesg only shows "[amdgpu]] ERROR Failed to get VBLANK!" several times.
Attachment 142769, "Dmesg-output":