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<body><span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
</span> changed
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Kernel 4.14.20, i915: pipe B vblank wait timed out"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105428">bug 105428</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
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<tr>
<td style="text-align:right;">Status</td>
<td>NEW
</td>
<td>RESOLVED
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<td style="text-align:right;">Resolution</td>
<td>---
</td>
<td>FIXED
</td>
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<b><a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Kernel 4.14.20, i915: pipe B vblank wait timed out"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105428#c14">Comment # 14</a>
on <a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - Kernel 4.14.20, i915: pipe B vblank wait timed out"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105428">bug 105428</a>
from <span class="vcard"><a class="email" href="mailto:jani.nikula@intel.com" title="Jani Nikula <jani.nikula@intel.com>"> <span class="fn">Jani Nikula</span></a>
</span></b>
<pre>(In reply to Peter Klotz from <a href="show_bug.cgi?id=105428#c13">comment #13</a>)
<span class="quote">> Is there a possibility to backport the fix for the original issue to LTS
> kernel 4.14?</span >
Perhaps... if we figure out what the fix was. The changes between v4.14.19 and
v4.14.20 are
$ git log --oneline v4.14.19..v4.14.20 -- drivers/gpu/drm
a51421b4cb09 drm/i915: Avoid PPS HW/SW state mismatch due to rounding
050b86b5bf20 drm/i915: Fix deadlock in i830_disable_pipe()
50018d09843c drm/i915: Redo plane sanitation during readout
19d8e5122fef drm/i915: Add .get_hw_state() method for planes
which don't strike me as likely culprits. As you say, merely adding more debug
outputs makes the problem less likely to occur. It could be something unrelated
to the driver.
I think the best bet would be to do a reverse git bisect to find the commit
that fixed this. Or bisect which commit introduced the problem in stable.
Anyway, seeing that the bug is fixed upstream, I'm closing the bug. Sorry. I
suggest updating to a newer kernel.</pre>
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