[Xcb] [Bug 94461] Compiz freezes when undocking Lenovo T450s, hang in xcb_wait_for_reply/wait_for_reply/_xcb_conn_wait

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94461

--- Comment #2 from cs_gon at yahoo.com ---
Some additional information:

I'm not sure if this is a libxcb bug, but I found some older bugs with pretty
much the same symptoms and call traces. This is the reason I reported it here.
If this is not a libxcb bug, hopefully you can point me in the right direction.

The problem started to appear after updating to the Wily HWE stack (with kernel
4.2). I cannot reproduce the problem with older kernels (e.g. 3.16 or 3.18),
but with any newer kernel, up to the latest 4.5 versions (including drm-next
and drm-intel-nightly branches).

As far I can see, compiz only uses one thread to do X calls. Especially for the
stack trace I attached, no other compiz threads were in any X calls. 

Compiz does not call XInitThreads(), but I added the call before any other X
calls, just in case. But then compiz does not fully start (shows the Unity
panels, but does not draw a background), and then hangs in a XLockDisplay()
call. And just like before, the other threads are not in any X calls. So IMHO
that does seem point in the direction of libxcb!?

If you need any more information, please let me know. Thanks!

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