[Bug 74918] New: [SNB] DP monitor randomly fails to get enabled

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74918

          Priority: medium
            Bug ID: 74918
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB] DP monitor randomly fails to get enabled
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: anton at khirnov.net
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 93990
  --> https://bugs.freedesktop.org/attachment.cgi?id=93990&action=edit
kernel output

Sometimes (I failed to find any specific triggers) after my DP monitor has been
in standby for a couple hours, the system will fail to wake it up. The kernel
output with drm debug on is attached.

My hardware is a SNB i7 2600K, lspci says
00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core
Processor Family Integrated Graphics Controller (rev 09)

I've been occasionally seeing this problem for some time now, with several
different kernels. Right now I'm on 3.13.0, libdrm 2.4.52-1 (debian testing),
mesa 10.0.2-1 (debian experimental), xf86-video-intel 2.21.15 (debian testing).

I'm leaving the machine in this stuck state (using the second GPU), so I should
be able to get any other information that might be needed.

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