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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [IGT][SKL] Failed DP link training attempt on resume with disconnected connector when testing with Chamelium"
href="https://bugs.freedesktop.org/show_bug.cgi?id=101917">101917</a>
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<th>Summary</th>
<td>[IGT][SKL] Failed DP link training attempt on resume with disconnected connector when testing with Chamelium
</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
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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
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<th>Reporter</th>
<td>paul.kocialkowski@linux.intel.com
</td>
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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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<div>
<pre>Created <span class=""><a href="attachment.cgi?id=132955" name="attach_132955" title="dmesg from 20170721 drm-tip">attachment 132955</a> <a href="attachment.cgi?id=132955&action=edit" title="dmesg from 20170721 drm-tip">[details]</a></span>
dmesg from 20170721 drm-tip
i915 attempts to perform DP link training on resume with a connector that was
reported as disconnected before suspend, which fails with:
[CONNECTOR:55:DP-1] Link Training failed at link rate = 162000, lane count = 4
This occurs when running the hdmi-edid-change-during-suspend IGT test with a
Chamelium connected to both the HDMI and DP port of the DUT. The chamelium test
will unplug all connectors (through their HPD line), including the concerned DP
connector (DP-1). It will then connect the HDMI connector for the test, and
suspend. The DP connector remains in a disconnected state, despite being
physically attached. i915 then attempts to perform the link training on the DP
connector.
If the DP connector is physically disconnected from the start, i915 does not
attempt to perform link training for it.
Information about the setup:
* Kernel: drm-tip 2a4f73050a961e1a176d35561e39386da9ea9c67
* Distro: Arch Linux (NOT using the distro's kernel)
* CPU: i5-6600K</pre>
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