[Bug 109001] Freezes when waking up after screen goes blank.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109001

            Bug ID: 109001
           Summary: Freezes when waking up after screen goes blank.
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: juliolokooo at gmail.com

Created attachment 142769
  --> https://bugs.freedesktop.org/attachment.cgi?id=142769&action=edit
Dmesg-output

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.

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