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<body><span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - [ILK][BAT] kms_pipe_crc_basic/nonblocking-crc-pipe-b underrun Dmesg Warnings"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98251">bug 98251</a>
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<table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>What</th>
<th>Removed</th>
<th>Added</th>
</tr>
<tr>
<td style="text-align:right;">i915 features</td>
<td>
</td>
<td>display/watermark
</td>
</tr>
<tr>
<td style="text-align:right;">Priority</td>
<td>medium
</td>
<td>highest
</td>
</tr></table>
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<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - [ILK][BAT] kms_pipe_crc_basic/nonblocking-crc-pipe-b underrun Dmesg Warnings"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98251#c1">Comment # 1</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - [ILK][BAT] kms_pipe_crc_basic/nonblocking-crc-pipe-b underrun Dmesg Warnings"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98251">bug 98251</a>
from <span class="vcard"><a class="email" href="mailto:ville.syrjala@linux.intel.com" title="Ville Syrjala <ville.syrjala@linux.intel.com>"> <span class="fn">Ville Syrjala</span></a>
</span></b>
<pre>I had though I fixed all the ILK underruns (well, all the ones not related to
cursor watermarks and/or sprite scaling which can still cause genuine underruns
easily), but now they seem to be back. So I suspect we have a regression on our
hands. Either that or it's due to eg. a hardware change.
Looking at the long term history for ilk-650, the first occurance seems to be
at CI_DRM_1688, but since the problem seems fairly sporadic, I can't be sure it
doesn't go further back. We have no results going back much further than that.
Though in recent times (maybe since CI_DRM_1706, or thereabouts) we seem to
have even more of these.
kms_pipe_crc_basic seems the most prominent offender here, but it looks like
kms_busy and drv_module_reload_basic have also hit these.</pre>
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