[Bug 99801] New: Rx480 doesn't output properly onto z27q at 5120x2880

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99801

            Bug ID: 99801
           Summary: Rx480 doesn't output properly onto z27q at 5120x2880
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: mtreinish at kortar.org
        QA Contact: xorg-team at lists.x.org

Created attachment 129569
  --> https://bugs.freedesktop.org/attachment.cgi?id=129569&action=edit
Example output when X first starts

I have a a z27q monitor and an rx480 gpu I've just purchased. When I startx on
the machine trying to run the monitor at it's native 5120x2880 across the 2
display ports doesn't work. The output is divided with the image mirrored
across both halves of the screen. Then one half is itself split in 2 with a
negative image that is scrolling horizontally. I took a picture with my
cellphone, since a screenshot showed the proper image.

I'm currently running the monitor over the single display port at a lower
resolution of 3840x2160 (albeit with heavy flickering, which I think is a
separate if not related issue)

The current output of xrandr is:

Screen 0: minimum 320 x 200, current 5040 x 2160, maximum 16384 x 16384
DisplayPort-0 connected primary 3840x2160+1200+0 (normal left inverted right x
axis y axis) 597mm x 336mm
   2560x2880     59.98 +
   2560x1440     59.95 +
   3840x2160     60.00* 
   1920x1080     60.00  
   1600x900      60.00  
   1366x768      59.99  
   1280x720      60.00    59.94  
   1024x768      60.00  
   800x600       60.32  
   640x480       60.00    59.94  
DisplayPort-1 connected (normal left inverted right x axis y axis)
   2560x2880     59.98 +
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 connected 1200x1920+0+0 left (normal left inverted right x axis y
axis) 474mm x 296mm
   1920x1200     59.95*+
   1920x1080     60.00  
   1600x1200     60.00  
   1680x1050     59.88  
   1400x1050     59.95  
   1280x1024     75.02    60.02  
   1440x900      74.98    59.90  
   1024x768      75.03    70.07    60.00  
   800x600       72.19    75.00    60.32

This might just be a configuration issue as I'm not used to the KMS way of
doing things. (I previously had an nvidia gpu using their binary blob on this
display without issue) But, from what I can tell things are being configured to
do the right thing automatically and it is not rendered properly over the wire.
(especially because when I tried to take a screenshot of the issue it looked
like it was supposed to)

I apologize that bug report lacks concrete details I'm willing to provide
whatever information is necessary to debug this. I'm just not sure where to
begin.

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