[Bug 99322] [SKL] Flashing black screen with dual monitors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99322

--- Comment #29 from Tim Small <tim at buttersideup.com> ---
I'll add an attachment in a moment, it follows a boot up.

The system was powered up with a single DP monitor, around 1 minute into the
boot, a second monitor was turned on (already connected to the other DP
connector - DP-2-8).

After a few minutes, both monitors went black for about 5 seconds, then the
left-hand monitor came back, but not the right-hand one (DP-2-8), which is in
power-saving mode.  Here is the xrandr output:

~$ xrandr
Screen 0: minimum 320 x 200, current 7680 x 2160, maximum 8192 x 8192
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 connected primary 3840x2160+0+0 (normal left inverted right x axis y axis)
621mm x 341mm
   3840x2160     60.00*+  30.00    25.00    24.00    29.97    23.98  
   1920x2160     59.99  
   2560x1440     59.95  
   1920x1080     60.00    60.00    50.00    50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1680x1050     59.95  
   1280x1024     60.02  
   1440x900      59.89  
   1280x960      60.00  
   1280x720      60.00    50.00    59.94  
   1024x768      60.00  
   800x600       60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       60.00    59.94  
HDMI-2 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-3 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
DP-2-8 connected 3840x2160+3840+0 (normal left inverted right x axis y axis)
621mm x 341mm
   3840x2160     30.00*+  25.00    24.00    29.97    23.98  
   2560x1440     59.95  
   1920x1200     59.95  
   1920x1080     60.00    50.00    59.94    30.00    25.00    24.00    29.97   
23.98  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     75.02    60.02  
   1280x800      59.91  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
DP-2-1 disconnected (normal left inverted right x axis y axis)

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