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

[Roman]

A minor addition. I find that X server often crashes when using smplayer
in the fullscreen mode (also with enabled option of auto-suspeding the
KWin compositing). It may happen when I am alt-tabbing to another window
or when I call the context menu or when I try to return to the windowed
mode or even when I just exit from smplayer. After this X server
restarts and in Xorg.0.log.old I see something very similar to what I
have already uploaded here.

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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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