[Bug 73855] New: Monitor flashes on and off

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73855

          Priority: medium
            Bug ID: 73855
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Monitor flashes on and off
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jordi at sindominio.net
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 92495
  --> https://bugs.freedesktop.org/attachment.cgi?id=92495&action=edit
dmesg output

I've recently started experiencing a display bug with my x230 while using the
docking station

In short, monitor starts flashing off and on; if I open the laptop's lid, I
find that display is also flashing. Undock, flashing on the laptop's display is
gone. Unplug the DisplayPort cable, dock laptop, and plug in cable back, and
things go back to normal.

This is Debian sid, xserver-xorg-video-intel 2.21.15, kernel 3.12

The kernel reports, with every flash (I think):

[45627.712157] WARNING: CPU: 1 PID: 1719 at
/build/linux-xS3nxO/linux-3.12.6/drivers/gpu/drm/i915/intel_display.c:8853
check_crtc_state+0x63f/0xb30 [i915]()
[45627.712158] pipe state doesn't match!
[45627.787006] WARNING: CPU: 0 PID: 1719 at
/build/linux-xS3nxO/linux-3.12.6/drivers/gpu/drm/i915/intel_dp.c:2538
ironlake_crtc_disable+0x17a/0x930 [i915]()

I'm not even sure if this is a problem with DRI or the intel driver, please
advise what additional info you might need.

XRandR
------
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 8192 x 8192
LVDS1 connected (normal left inverted right x axis y axis)
   1366x768       60.0 +
   1360x768       59.8     60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 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)
DP2 connected primary 1920x1200+0+0 (normal left inverted right x axis y axis)
518mm x 324mm
   1920x1200      60.0*+
   1920x1080      60.0  
   1600x1200      60.0  
   1680x1050      60.0  
   1280x1024      60.0  
   1280x960       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        60.0  
   720x400        70.1  
DP3 disconnected (normal left inverted right x axis y axis)

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