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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Compiz freezes when undocking Lenovo T450s, hang in xcb_wait_for_reply/wait_for_reply/_xcb_conn_wait"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94461">94461</a>
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<th>Summary</th>
<td>Compiz freezes when undocking Lenovo T450s, hang in xcb_wait_for_reply/wait_for_reply/_xcb_conn_wait
</td>
</tr>
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<th>Product</th>
<td>XCB
</td>
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<th>Version</th>
<td>1.11
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>major
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Library
</td>
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<th>Assignee</th>
<td>xcb@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>cs_gon@yahoo.com
</td>
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<th>QA Contact</th>
<td>xcb@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=122174" name="attach_122174" title="compiz stack trace">attachment 122174</a> <a href="attachment.cgi?id=122174&action=edit" title="compiz stack trace">[details]</a></span>
compiz stack trace
When undocking my Lenovo T450s from the docking station (with external monitor
connected), compiz frequently freezes, especially when an application is
running, that does a lot of screen updates (i.e. terminal with top running at a
low refresh frequency, or something like glxgears).
This happens since updating a 14.04 system to the Wily HWE stack (libxcb 1.10),
but it is also reproducible when using Xenial (with libxcb 1.11).
When compiz freezes, the screen gets kinda corrupted (will attach an screen
shot). The screen does not get updated, only the mouse cursor works. When
docking the notebook again, compiz recovers most of the time. Sometimes though,
nothing happens and compiz keeps frozen. In this state only a restart of compiz
or the X-Server (from the text console) help to get the system usable again.
When doing a stack trace on compiz, it hangs in xcb_wait_for_reply /
wait_for_reply / _xcb_conn_wait. I will attach the full stack trace. The stack
trace was captured with libxcb 1.10, but as mentioned above, the problem does
also happen with libxcb 1.11).</pre>
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