Bug 454902

SUMMARY
***
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***
I have a 3 monitor setup on a AMD 6900XT GPU. All three have been working recently. However, after an update the one monitor using Display Port does not get a signal AFTER login to KDE Plasma in Fedora 36. 

Tried in Fedora 36 in KDE 5.24.5. With kernel 5.17.12-300 and also trying kernel 5.17.11 and 5.17.9. 
This issue happens in Wayland and X11
The monitor does appear to show once logged in in Display Configuration (it's there as in a space for it but it's blank space). 

Tried installing LXQT DE and all three monitors work fine. It's just an issue in KDE Plasma as far as I can test. 

STEPS TO REPRODUCE
1.  Login to KDE Plasma (X11 or Wayland)


OBSERVED RESULT
2. After logging in two monitor (HDMI) initiate. The third monitory DP connection gets a 'no signal' error and remains blank.

EXPECTED RESULT
3. 3rd monitor initializes

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 5.24.5
(available in About System)
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.93.0
Qt Version: 5.15.3

ADDITIONAL INFORMATION
xrandr output:

Screen 0: minimum 320 x 200, current 7840 x 2560, maximum 16384 x 16384
DisplayPort-0 disconnected (normal left inverted right x axis y axis)
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 connected primary 2560x1440+0+0 (normal left inverted right x axis y axis) 698mm x 393mm
   2560x1440    143.97*+ 120.00    59.95  
   1920x1200    143.97  
   1920x1080    120.00   119.88    60.00    60.00    50.00    59.94  
   1600x1200    143.97  
   1680x1050    119.99    59.88  
   1280x1024    119.96    75.02    60.02  
   1440x900     119.85    59.90  
   1280x800     143.97  
   1280x720      60.00    50.00    59.94  
   1440x576      50.00  
   1024x768      75.03    70.07    60.00  
   1440x480      60.00    59.94  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    72.81    66.67    60.00    59.94  
   720x400       70.08  
HDMI-A-1 connected 1440x2560+6400+0 left (normal left inverted right x axis y axis) 597mm x 336mm
   2560x1440     74.60 +  59.95* 
   1920x1200     74.60  
   1920x1080     60.00    50.00    59.94  
   1600x1200     74.60  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1440x900      59.90  
   1280x960      60.00  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1440x576      50.00  
   1024x768      75.03    70.07    60.00  
   1440x480      60.00    59.94  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    66.67    60.00    59.94  
   720x400       70.08  
DisplayPort-2 connected (normal left inverted right x axis y axis)
   3840x2160     60.00 +  60.00    50.00    59.94    30.00    25.00    24.00    29.97    23.98    29.97  
   2560x1440     59.95  
   1920x1080     60.00    50.00    59.94    30.00    25.00    24.00    29.97    23.98  
   1600x1200     60.00  
   1680x1050     59.95  
   1600x900      60.00  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   1440x480      60.00    59.94  
   832x624       74.55  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
DisplayPort-3 disconnected (normal left inverted right x axis y axis)