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[Bug 1552262] [NEW] Compiz freezes when undocking Lenovo T450s


Public bug reported:

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

This happens since updating a 14.04 system to the Wily HWE stack, but it
is also reproducible when using Wily or Xenial.

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.

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "screen shot of frozen compiz"

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  Compiz freezes when undocking Lenovo T450s

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