This bug was fixed in the package xorg-server - 2:1.11.4-0ubuntu6
---------------
xorg-server (2:1.11.4-0ubuntu6) precise; urgency=low
* debian/patches/500_pointer_barrier_thresholds.diff:
- Don't try to send events from the context of the SIGIO handler. That
leads to the dark side, or at least to server freezes when trying to
reveal the launcher in Unity (LP: #946954). May also fix other seemingly
random X server crashes.
- Add build-time tests to make check for barrier behaviour. These are
disabled, pending gtest, xorg-gtest, and xserver-xorg-video-dummy MIRs.
-- Christopher James Halse Rogers <[email protected]> Fri, 09 Mar 2012
19:16:02 +1100
** Changed in: xorg-server (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/946954
Title:
Deadlock on attempting to reveal launcher
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