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

        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW --- - [HSW] [drm]stuck on render ring / Hangs for a while, and then continues with glitches."
   href="https://bugs.freedesktop.org/show_bug.cgi?id=80229">80229</a>
          </td>
        </tr>

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

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

        <tr>
          <th>Summary</th>
          <td>[HSW]  [drm]stuck on render ring / Hangs for a while, and then continues with glitches.
          </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>Linux (All)
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>byoungchan.lee.public@gmail.com
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>SPARC
          </td>
        </tr>

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

        <tr>
          <th>Version</th>
          <td>XOrg CVS
          </td>
        </tr>

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

        <tr>
          <th>Product</th>
          <td>DRI
          </td>
        </tr></table>
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        <div>
        <pre>Created <span class=""><a href="attachment.cgi?id=101353" name="attach_101353" title="Xorg.0.log">attachment 101353</a> <a href="attachment.cgi?id=101353&action=edit" title="Xorg.0.log">[details]</a></span>
Xorg.0.log

Bug description:
Hangs for a while, and then continues with some character or window glitches.

System environment:
-- chipset: Intel Pentium 3556U with haswell-based mobile graphics.
-- system architecture: x86_64
-- xf86-video-intel: 2.99.910-0ubuntu1
-- xserver: 1.15.1-0ubuntu2
-- mesa: 10.1.3-0ubuntu0.1
-- libdrm: 2.4.52-1
-- kernel: 3.13.0-29-generic
-- Linux distribution: Ubuntu 14.04
-- Machine or mobo model: Lenovo IdeaPad S310 (LENOVO_MT_20300)


Reproducing steps:
While using programs like firefox(usually hang occurs while surfing complex
webpage.) or libreoffice, system hangs for a while.(usually 3~10 seconds.)
After that, system hangs for a while, and then continues with some character or
window glitches.


Additional info:

Xorg.0.log, dmesg, i915_error_state, syslog (/var/log/syslog) attached.

  render command stream:
    IPEHR: 0x780c0000</pre>
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