[Bug 107560] radeon (amdgpu) GDM flip queue failed invalid argument, DisplayPort issues

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107560

--- Comment #9 from Fermulator <freedesktop-bugs at fermulator.fastmail.org> ---
this morning, at the system physically

the issue I submitted originally is no longer happening (there have been
several kernel updates since original submission ...)

$ uname -r
4.17.17-100.fc27.x86_64

now however, the symptom is:

noticed that the same monitor (connected via DisplayPort) had mis-match
capabilities (wasn't able to go max resolution)

```
$ xrandr
Screen 0: minimum 320 x 200, current 3840 x 1200, maximum 16384 x 16384
DisplayPort-0 connected primary 1920x1080+0+0 (normal left inverted right x
axis y axis) 0mm x 0mm
   1920x1080     59.95* 
   1600x1200     59.95  
   1680x1050     59.95  
   1280x1024     59.95  
   1440x900      59.95  
   1280x800      59.95  
   1280x720      59.95  
   1024x768      59.95  
   800x600       59.95  
   640x480       59.95  
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 connected 1920x1200+1920+0 (normal left inverted right x axis y axis)
518mm x 324mm
   1920x1200     59.95*+
   1920x1080     59.95  
   1600x1200     60.00  
   1680x1050     59.95  
   1280x1024     60.02  
   1440x900      59.95  
   1280x960      60.00  
   1280x800      59.95  
   1280x720      59.95  
   1024x768      60.00  
   800x600       60.32    56.25  
   640x480       59.94  
```

The "   1920x1200     59.95*+" option is missing from the display port monitor.

If I disconnect the DP, and reconnect, it comes back.

```
$ xrandr | grep +
DisplayPort-0 connected primary 1920x1200+0+0 (normal left inverted right x
axis y axis) 518mm x 324mm
   1920x1200     59.95*+
DVI-D-0 connected 1920x1200+1920+0 (normal left inverted right x axis y axis)
518mm x 324mm
   1920x1200     59.95*+
```

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