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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Linux 4.5 regression: FIFO underruns on Skylake"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94337">94337</a>
</td>
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<th>Summary</th>
<td>Linux 4.5 regression: FIFO underruns on Skylake
</td>
</tr>
<tr>
<th>Product</th>
<td>DRI
</td>
</tr>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>luto@mit.edu
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>See previous discussion here:
<a href="https://lists.freedesktop.org/archives/intel-gfx/2016-February/087710.html">https://lists.freedesktop.org/archives/intel-gfx/2016-February/087710.html</a>
On my Skylake laptop (Dell XPS 13 9350), I see relatively frequent FIFO
underruns. This only happens after suspend/resume -- I haven't seem them
before the first suspend after a reboot.
My best guess is that this is the same issue as <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [ILK] [v4.5-rc1] FIFO underrun and flickering screen on cursor hide"
href="show_bug.cgi?id=93945">bug 93945</a> but that the fix for
that bug didn't work on Skylake. However, I *do* see underruns while the
cursor is visible, but I don't seem to see them unless I've stopped interacting
with the machine for a second or two.
The problem is still present in 4.5-rc6. I'm using Fedora 23.
I can't dump VBIOS because "i915 0000:00:02.0: Invalid PCI ROM header
signature: expecting 0xaa55, got 0xffff". I'll keep poking PCI maintainers
about that. intel_reg_dumper output is in the mailing list thread.</pre>
</div>
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