[Bug 90951] New: 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

            Bug ID: 90951
           Summary: HD4000: Display connected to displayport doesn't wake
                    up when it's turn off and on or enters power saving
                    mode
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.18.1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: rauchwolke at gmx.net
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

I use a x220 with a Hd4000 GPU. It only supports two display at the same time
and has a Display connected to the displayport and one connected to the VGA
port (both are active and the integrated display is turned off)

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)

After the display that is connted to the displayport is turned off and on again
the display doesnt work anymore and goes back into power saving mode after a
few seconds. When i turn off the display and turn it on again with xrandr it
works again.The same happens when i just use the display at the display port
and the internal display. The same thing also happens when the display
connected to the displayport enters sleeping mode, most of the time.

The display at the VGA port works as expected.

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