[Bug 90951] HD4000: Display connected to displayport doesn't wake up when it's turn off and on or enters power saving mode

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=90951

--- Comment #1 from Thomas Mann <rauchwolke at gmx.net> ---
after the display stopped working, the output of xrandr looks like this:

Screen 0: minimum 8 x 8, current 3584 x 1080, maximum 32767 x 32767
LVDS1 connected (normal left inverted right x axis y axis)
   1366x768       60.0 +
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
DP1 connected primary 2560x1080+0+0 (normal left inverted right x axis y axis)
677mm x 290mm
   2560x1080      60.0*+
   1920x1080      60.0     60.0     50.0     59.9  
   1920x1080i     60.1     50.0     60.0  
   1680x1050      60.0  
   1600x900       60.0  
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1280x720       60.0     50.0     59.9  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   720x576        50.0  
   720x480        60.0     59.9  
   640x480        75.0     60.0     59.9  
   720x400        70.1  
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 disconnected (normal left inverted right x axis y axis)
VGA1 connected 1024x768+2560+0 (normal left inverted right x axis y axis) 920mm
x 518mm
   1024x768       60.0*+   75.1     70.1  
   800x600        85.1     72.2     75.0     60.3     56.2  
   848x480        60.0  
   640x480        85.0     75.0     72.8     60.0     59.9  
   720x400        70.1  
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

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