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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [pnv regression] Hang upon resume"
href="https://bugs.freedesktop.org/show_bug.cgi?id=74022">74022</a>
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<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[pnv regression] Hang upon resume
</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>
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<th>OS</th>
<td>All
</td>
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<th>Reporter</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</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>
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<th>Product</th>
<td>DRI
</td>
</tr></table>
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<pre>Between 3.12 and drm-intel-nightly, we loose coherency after resume.
ring->get_seqno() = 0xffffeffe, but hws[0x20] = 0xfffff001
so the gpu is advancing and writing to the hws page, but the seqno is not
visible by the CPU - the cache snooping is bust. For SNB+, we had a similar
issue which required flushing the ring TLBs.
Bisect in progress.</pre>
</div>
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