Public bug reported:

Ubuntu release: KUbuntu 12.04 (beta)
libdrm-intel1 2.4.32, xserver-xorg-core 1.11.4

In the Ubuntu 12.04 with the KWin option "suspend desktop effects for 
fullscreen windows"
enabled, I often get X crashes. This usually occures when I just exit from a 
fullscreen application,
before the usual KDE desktop should show up. Such thing usually happens with 
applications running
under wine, but recently I got a similar crash with the usual KDE screensaver. 
X server just restarts
and all unsaved work in my KDE session gets lost.

In the Xorg.0.log.old I find some stack backtrace, which may differ from case 
to case, but it always
ends in libdrm_intel. I attach a few examples below. I realize that these logs 
are possibly not very useful
(there are only raw addresses), but I have no idea how to make X to dump more 
detailed backtrace,
with full debug info. These crashes are rather well reproducible, and if 
someone explains how to get
more detailed information, I will gladly do this.

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

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https://bugs.launchpad.net/bugs/974041

Title:
  KWin option of auto-suspending for fullscreen windows often causes X
  to crash in libdrm_intel

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