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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [IVB bisected] [drm:intel_dp_aux_ch] *ERROR* dp aux hw did not signal timeout (has irq: 1)!"
href="https://bugs.freedesktop.org/show_bug.cgi?id=96428">96428</a>
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<th>Summary</th>
<td>[IVB bisected] [drm:intel_dp_aux_ch] *ERROR* dp aux hw did not signal timeout (has irq: 1)!
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>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
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>chris.bainbridge@gmail.com
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<pre>Created <span class=""><a href="attachment.cgi?id=124389" name="attach_124389" title="0001-Revert-d1d70677e165-drm-i915-make-fbdev-initializati.patch">attachment 124389</a> <a href="attachment.cgi?id=124389&action=edit" title="0001-Revert-d1d70677e165-drm-i915-make-fbdev-initializati.patch">[details]</a></span> <a href='page.cgi?id=splinter.html&bug=96428&attachment=124389'>[review]</a>
0001-Revert-d1d70677e165-drm-i915-make-fbdev-initializati.patch
Boot error intermittently appears around 6% of the time (with external displays
and active DP adaptors):
[ 1.447236] [drm:intel_dp_aux_ch] *ERROR* dp aux hw did not signal timeout
(has irq: 1)!
The error does not seem to cause any real problems as all displays still work
fine.
A lengthy and interesting bisect shows the cause of this is two interacting
commits, reverting either of these commits results in the error disappearing
entirely (auto revert of d1d706 on current git master is not clean, equivalent
patch attached):
commit 2ed903c5485bad0eafdd3d59ff993598736e4f31
Author: Chuansheng Liu <<a href="mailto:chuansheng.liu@intel.com">chuansheng.liu@intel.com</a>>
Date: Thu Sep 4 15:17:55 2014 +0800
cpuidle: Use wake_up_all_idle_cpus() to wake up all idle cpus
Currently kick_all_cpus_sync() or smp_call_function() can not
break the polling idle cpu immediately.
Instead using wake_up_all_idle_cpus() which can wake up the polling idle
cpu quickly is much more helpful for power.
commit d1d70677e165826f3fa9966e1b7ec3765d7c0fb7
Author: Jesse Barnes <<a href="mailto:jbarnes@virtuousgeek.org">jbarnes@virtuousgeek.org</a>>
Date: Wed May 28 14:39:03 2014 -0700
drm/i915: make fbdev initialization asynchronous v2
This gets us out of our init code and out to userspace quite a bit
faster, but does open us up to some bugs given the state of our init
time locking.
v2: switch to async_schedule (Chris)
check with lockdep, seems happy (Jesse)
move hotplug enable flag set to fbdev_initial_config (Jesse)
This bug might be related to <a class="bz_bug_link
bz_status_NEW "
title="NEW - [i915 Skylake] HDMI output does not work with some adapters"
href="show_bug.cgi?id=92685">bug #92685</a></pre>
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