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<body><span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span> changed
<a class="bz_bug_link
bz_status_NEW "
title="NEW - Intel card (Coffeelake) short freezes (hang) after upgrade to kernel 5.3.4"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111919">bug 111919</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;">Whiteboard</td>
<td>Triaged
</td>
<td>Triaged, ReadyForDev
</td>
</tr>
<tr>
<td style="text-align:right;">Severity</td>
<td>normal
</td>
<td>major
</td>
</tr>
<tr>
<td style="text-align:right;">CC</td>
<td>
</td>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<td style="text-align:right;">Priority</td>
<td>medium
</td>
<td>high
</td>
</tr>
<tr>
<td style="text-align:right;">Status</td>
<td>NEEDINFO
</td>
<td>NEW
</td>
</tr></table>
<p>
<div>
<b><a class="bz_bug_link
bz_status_NEW "
title="NEW - Intel card (Coffeelake) short freezes (hang) after upgrade to kernel 5.3.4"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111919#c10">Comment # 10</a>
on <a class="bz_bug_link
bz_status_NEW "
title="NEW - Intel card (Coffeelake) short freezes (hang) after upgrade to kernel 5.3.4"
href="https://bugs.freedesktop.org/show_bug.cgi?id=111919">bug 111919</a>
from <span class="vcard"><a class="email" href="mailto:lakshminarayana.vudum@intel.com" title="Lakshmi <lakshminarayana.vudum@intel.com>"> <span class="fn">Lakshmi</span></a>
</span></b>
<pre>(In reply to Chris Wilson from <a href="show_bug.cgi?id=111919#c5">comment #5</a>)
<span class="quote">> Disabling dmc will prevent reaching package c-state 8+, otherwise it should
> be no impact, so we are on the lookout to see if it hangs again.</span >
(In reply to Stanislav Ochotnicky from <a href="show_bug.cgi?id=111919#c7">comment #7</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=145727" name="attach_145727" title="/sys/class/drm/card0/error output with i915.dmc_firmware_path=/dev/null">attachment 145727</a> <a href="attachment.cgi?id=145727&action=edit" title="/sys/class/drm/card0/error output with i915.dmc_firmware_path=/dev/null">[details]</a></span>
> /sys/class/drm/card0/error output with i915.dmc_firmware_path=/dev/null
>
> I have managed to reproduce again - even after upgrading kernel to 5.3.5 and
> adding i915.dmc_firmware_path=/dev/null kernel command line option.
>
> Attaching new output of /sys/class/drm/card0/error
>
> I haven't yet found an exact reproducer, but will try to dig. My current two
> leads/ideas are:
> * Related to suspend/resume (i.e. I don't remember seeing hang after fresh
> boot, only after suspend/resume cycle)
> * Related to IOMMU/2nd video card being assigned to a VM
>
> Both of the above might be wild goose chases at this point though.</span >
CC'ing Chris.</pre>
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