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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Broadwell] Monitor on DP docking station causes odd behavior"
href="https://bugs.freedesktop.org/show_bug.cgi?id=98919">98919</a>
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<th>Summary</th>
<td>[Broadwell] Monitor on DP docking station causes odd behavior
</td>
</tr>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</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
</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>inform@tiker.net
</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>
</tr></table>
<p>
<div>
<pre>I'm not sure I've got this down to a repeatable pattern yet, but the behavior
is certainly "odd". I've got a ThinkPad X250 with an associated docking
station. I have a Dell P2715Q (4K) monitor plugged into a display port on the
docking station. The monitor seems to be detected OK and work fine upon first
being plugged in, and it certainly works OK if it's plugged in from boot.
Things start to awry when the monitor is disconnected (either by removing the
computer from the docking station, or by removing the monitor plug). At that
point, "xrandr" starts taking a long time and, irrespective of the actual
monitors plugged in, reports a phantom monitor on the port where the
now-disappeared monitor was:
DP-2-2 connected 1024x768+1920+0 (normal left inverted right x axis y axis) 0mm
x 0mm
1024x768 60.00*
800x600 60.32 56.25
848x480 60.00
640x480 59.94
At this point, no further monitor plugging/unplugging seems to have any effect.
This is on Debian's kernel 4.9rc5. I'll test with 4.6 next and see what I get.
Related (but not certainly identical) bugs include <a class="bz_bug_link
bz_status_NEW "
title="NEW - i915 / drm crash when undocking from DP monitors"
href="show_bug.cgi?id=98211">bug 98211</a>.
Debian bug template:
<a href="https://gist.github.com/inducer/4a382ef00efc10fe1104f701267fe999">https://gist.github.com/inducer/4a382ef00efc10fe1104f701267fe999</a>
(kernel/software versions, logs, etc.)</pre>
</div>
</p>
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