[Bug 107731] radeon (amdgpu) DisplayPort loss of max-resolution on DP monitor (after monitor power saving / idle)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107731

--- Comment #2 from L.S.S. <ragnaros39216 at yandex.com> ---
Some extra information.

uname -r
4.20.11-1-MANJARO

The correct xrandr output:

Screen 0: minimum 320 x 200, current 3840 x 2160, maximum 16384 x 16384
DisplayPort-0 connected primary 3840x2160+0+0 (normal left inverted right x
axis y axis) 596mm x 335mm
   3840x2160     60.00*+  29.98  
   2560x1600     74.97    59.97  
   2560x1440     59.95  
   1920x1440     75.00    60.00  
   1856x1392     75.00    60.00  
   1792x1344     75.00    60.00  
   2048x1152     60.00  
   1920x1200     74.93    59.88  
   1920x1080     60.00    60.00    50.00    59.94  
   1600x1200     75.00    70.00    65.00    60.00  
   1680x1050     74.89    59.95  
   1400x1050     74.87    59.98  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1440x900      74.98    59.89  
   1280x960      60.00  
   1366x768      59.79  
   1360x768      60.02  
   1280x800      74.93    59.81  
   1152x864      75.00  
   1280x768      74.89    59.87  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    70.07    60.00  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   848x480       60.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    60.00    59.94  
   720x400       70.08  

The "incorrect" xrandr output (after power-cycling the monitor):

Screen 0: minimum 320 x 200, current 1792 x 1344, maximum 16384 x 16384
DisplayPort-0 connected primary 1792x1344+0+0 (normal left inverted right x
axis y axis) 596mm x 335mm
   1792x1344     60.00* 
   2048x1152     60.00  
   1920x1200     59.88  
   1920x1080     60.00    60.00    50.00    59.94  
   1600x1200     75.00    70.00    65.00    60.00  
   1680x1050     74.89    59.95  
   1400x1050     74.87    59.98  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1440x900      74.98    59.89  
   1280x960      60.00  
   1366x768      59.79  
   1360x768      60.02  
   1280x800      74.93    59.81  
   1152x864      75.00  
   1280x768      74.89    59.87  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    70.07    60.00  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   848x480       60.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    60.00    59.94  
   720x400       70.08  
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 disconnected (normal left inverted right x axis y axis)

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