[Bug 91407] New: [SNB] switching monitor off and on breaks DP output

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91407

            Bug ID: 91407
           Summary: [SNB] switching monitor off and on breaks DP output
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: anton at khirnov.net
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

After turning the monitor on again, there is no signal on the DP output. HDMI
still works fine. I first found the issue in 3.18 and it's still present in
4.0.7.

Doing 'xrandr --output DP2 --off; xrandr --output DP2 --auto' makes it work
again, but it has to be done from X, with the monitor switched to DP.

My HW is
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)

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