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<b><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#c5">Comment # 5</a>
on <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">bug 94337</a>
from <span class="vcard"><a class="email" href="mailto:luto@mit.edu" title="Andy Lutomirski <luto@mit.edu>"> <span class="fn">Andy Lutomirski</span></a>
</span></b>
<pre>I have not reproduced this problem in 4.6-rc1, so it might be fixed.
If I had to guess, I'd say this was:
commit bf22045250fafbe733277e13300eaa240ba2104d
Author: Matt Roper <<a href="mailto:matthew.d.roper@intel.com">matthew.d.roper@intel.com</a>>
Date: Tue Jan 19 11:43:04 2016 -0800
Revert "drm/i915: Add two-stage ILK-style watermark programming (v10)"
which is the fix for <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [BAT ILK SNB IVB bisected] Fifo underruns since CI_DRM_952"
href="show_bug.cgi?id=93640">bug 93640</a>.
I think there is something wrong with your release process. v4.5 has:
commit e2e407dc093f530b771ee8bf8fe1be41e3cea8b3
Author: Matt Roper <<a href="mailto:matthew.d.roper@intel.com">matthew.d.roper@intel.com</a>>
AuthorDate: Mon Feb 8 11:05:28 2016 -0800
Commit: Jani Nikula <<a href="mailto:jani.nikula@intel.com">jani.nikula@intel.com</a>>
CommitDate: Tue Feb 9 11:24:39 2016 +0200
drm/i915: Pretend cursor is always on for ILK-style WM calculations (v2)
v4.6-rc1 also has:
commit b2435692dbb709d4c8ff3b2f2815c9b8423b72bb
Author: Matt Roper <<a href="mailto:matthew.d.roper@intel.com">matthew.d.roper@intel.com</a>>
AuthorDate: Tue Feb 2 22:06:51 2016 -0800
Commit: Matt Roper <<a href="mailto:matthew.d.roper@intel.com">matthew.d.roper@intel.com</a>>
CommitDate: Wed Feb 3 05:59:03 2016 -0800
drm/i915: Pretend cursor is always on for ILK-style WM calculations (v2)
What gives? (I haven't confirmed that the latter is the change that fixes
this.)</pre>
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