[Bug 974041] Re: KWin option of auto-suspending for fullscreen windows often causes X to crash in libdrm_intel

[Roman]

I have installed all updates accumulated for Precise during the last week, the bug still persists, no apparent changes.
After that I've done full upgrade from the current xorg-edgers ppa, and these crashes dissappeared (although some other minor problems emerged, but not so disruptive).
It seems that the fix for this bug probably already exists, it just needs to be backported in the official Precise packages...

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

Status in “libdrm” package in Ubuntu:
  New

Bug description:
  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.

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