[Bug 73943] New: [snb i915] DP Flicker

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73943

          Priority: medium
            Bug ID: 73943
          Assignee: chris at chris-wilson.co.uk
           Summary: [snb i915] DP Flicker
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: crshman at gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Hello,

I'm currently experiencing an issue where my two display port driven screens
flicker randomly. At first I thought this was a kernel driver issue but as the
kernel modules have progress I'm thinking less so.

I'm currently working through a FIFI underrun here:
https://bugs.freedesktop.org/show_bug.cgi?id=70254

However I've noticed that my screen blanks no longer accurately correlate with
the "[drm:ilk_display_irq_handler], Pipe X FIFO underrun" logs that are being
spit out.

I can have many screen flickers but nothing is output in the logs, which leads
be to believe the error is somewhere higher in the stack.

My hardware is a lenovo X220 with a sandybridge era i7.

# uname -a
Linux rnavarro-thinkpad 3.13.0-994-generic #201401210405 SMP Tue Jan 21
09:05:52 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

I'm currently running on ubuntu 13.10 with the latest 3.13 mainline kernel and
packages from the xorg-edgers PPA which includes xserver-xorg-video-intel at
"2:2.99.907+git20140117.f23ab963-0ubuntu0sarvatt~saucy"

I'm attaching a few logs, but any assistance in helping me track down this
flicker would be great!

Let me know what other information is required.

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