[Bug 107503] Native screen resolution not working correctly over HDMI LSPCON (i915)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107503

--- Comment #15 from Nicholas Stommel <nicholas.stommel at gmail.com> ---
Even worse, the problem happens and is irreversible after a 'good boot' if
xrandr is used to change atomic settings like "Broadcast RGB" as in the
following (note how five display modes completely disappear):

$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-3 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis)
598mm x 336mm
   1920x1080     60.00*+  50.00    59.94  
   1680x1050     59.88  
   1600x900      60.00  
   1280x1024     60.02  
   1440x900      59.90  
   1280x800      59.91  
   1280x720      60.00    50.00    59.94  
   1024x768      70.07    60.00  
   800x600       72.19    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       66.67    60.00    59.94  
   720x400       70.08  

$ xrandr --output DP-3 --set "Broadcast RGB" "Full"
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  21 (RRSetCrtcConfig)
  Serial number of failed request:  61
  Current serial number in output stream:  61

$ xrandr
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 8192 x 8192
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-3 connected primary 1280x800+0+0 (normal left inverted right x axis y axis)
598mm x 336mm
   1280x800      59.91* 
   1024x768      60.00  
   800x600       72.19    60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       66.67    60.00    59.94  
   720x400       70.08  

$ xrandr --output DP-3 --mode 1920x1080
xrandr: cannot find mode 1920x1080

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