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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - External display not working - failed to enable link training, failed to start channel equalization"
href="https://bugs.freedesktop.org/show_bug.cgi?id=73705">73705</a>
</td>
</tr>
<tr>
<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>External display not working - failed to enable link training, failed to start channel equalization
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>krzysiek@skyman.pl
</td>
</tr>
<tr>
<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>XOrg CVS
</td>
</tr>
<tr>
<th>Component</th>
<td>DRM/Intel
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
</tr></table>
<p>
<div>
<pre>On DELL LATTITUDE E5540,
kernel-3.13.0-rc8
xorg-server-1.15
xf86-video-intel-2.99.907-r1
Boot hangs when KMS with external display connected (DVI-D/VGA to docking
station or VGA with docking station disconnected).
It boots completely fine when display is disconnected.
If I connect display with X started (in vt7 console) desktop hangs, I cannot
switch to different console.
If I connect display after starting X and switching to text console it works
until I switch to X console (vt7).
Few seconds after disconnecting console everything starts working correctly.
In dmesg it prints only:
[ 158.165329] [drm:intel_dp_start_link_train] *ERROR* failed to enable link
training
[ 158.168028] [drm:intel_dp_complete_link_train] *ERROR* failed to start
channel equalization</pre>
</div>
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