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    <head>
      <base href="https://bugs.freedesktop.org/" />
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    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [snb i915] DP Flicker"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=73943">73943</a>
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>chris@chris-wilson.co.uk
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>[snb i915] DP Flicker
          </td>
        </tr>

        <tr>
          <th>QA Contact</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>normal
          </td>
        </tr>

        <tr>
          <th>Classification</th>
          <td>Unclassified
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>All
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>crshman@gmail.com
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>Other
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>git
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>Driver/intel
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>xorg
          </td>
        </tr></table>
      <p>
        <div>
        <pre>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:
<a class="bz_bug_link 
          bz_status_ASSIGNED "
   title="ASSIGNED --- - [snb dp hotplug] Pipe B, PCH transcoder B FIFO underrun"
   href="show_bug.cgi?id=70254">https://bugs.freedesktop.org/show_bug.cgi?id=70254</a>

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.</pre>
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