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    <head>
      <base href="https://bugs.freedesktop.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - CPU pipe A FIFO underrun"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=100219">100219</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>CPU pipe A FIFO underrun
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>x86-64 (AMD64)
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Linux (All)
          </td>
        </tr>

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

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

        <tr>
          <th>Priority</th>
          <td>medium
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>DRM/Intel
          </td>
        </tr>

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

        <tr>
          <th>Reporter</th>
          <td>udo@hypervisor.org
          </td>
        </tr>

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

        <tr>
          <th>CC</th>
          <td>intel-gfx-bugs@lists.freedesktop.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=130233" name="attach_130233" title="dmesg">attachment 130233</a> <a href="attachment.cgi?id=130233&action=edit" title="dmesg">[details]</a></span>
dmesg

The following CPU pipe A underrun can be observed during booting Linux-4.10.X
on an Intel SNB processor. It is 100% reproducible during every boot and it
occurs before any other software runs.

[    1.071498] [drm] Initialized
[    1.071698] [drm] Disabling PPGTT because VT-d is on
[    1.071714] [drm] Memory usable by graphics device = 2048M
[    1.071717] [drm] VT-d active for gfx access
[    1.071721] [drm] Replacing VGA console driver
[    1.071736] [drm] DMAR active, disabling use of stolen memory
[    1.078093] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.078099] [drm] Driver supports precise vblank timestamp query.
[    1.151068] [drm] Initialized i915 1.6.0 20161121 for 0000:00:02.0 on minor
0
[    1.365751] fbcon: inteldrmfb (fb0) is primary device
[    2.224399] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A
FIFO underrun
[    2.227469] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR* uncleared
pch fifo underrun on pch transcoder A
[    2.227478] [drm:cpt_irq_handler] *ERROR* PCH transcoder A FIFO underrun
[    2.414759] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device

Full dmesg attached.</pre>
        </div>
      </p>


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