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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [SKL EDP] DP Aux A is not working without first disabling DC6"
href="https://bugs.freedesktop.org/show_bug.cgi?id=91876">91876</a>
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<th>Summary</th>
<td>[SKL EDP] DP Aux A is not working without first disabling DC6
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>DRI git
</td>
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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
</td>
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<th>Component</th>
<td>DRM/Intel
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>patrik.r.jakobsson@gmail.com
</td>
</tr>
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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
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=118078" name="attach_118078" title="dmesg">attachment 118078</a> <a href="attachment.cgi?id=118078&action=edit" title="dmesg">[details]</a></span>
dmesg
DP Aux A is not working without first disabling DC6. Not really a regression
but since commit a7f749f9c7e8222405740f6081bd183137d1d6f2 the DMC is working
and we can enter DC states which made this bug visible. The result is that
modesetting takes a few seconds but still succeeds.
We get a few of these:
[drm:intel_dp_aux_ch [i915]] *ERROR* dp aux hw did not signal timeout (has irq:
1)!
Before finally giving up with:
[drm:intel_dp_aux_ch [i915]] *ERROR* dp_aux_ch not done status 0xad40001f
I'm currently writing code to allow for power domain get/put to disable/enable
dc states for platform restrictions.</pre>
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