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

[Roman]

X still crashes in the final release of KUbuntu 12.04, as previously.
Upgrading from xorg-edgers eliminates the problem too.

However, I performed a more detailed investigation, and I find that
upgrading of only the package libdrm-intel1 (with a few other required
by dependencies, including libdrm2, libkms1) does not cure the problem.
This means that the problem is not in libdrm, as I originally assumed
(although the backtraces always end in libdrm_intel.so). It now seems
that the problem is in xserver-xorg-video-intel or in X server itself
(they can be upgraded only simultaneously, due to the package
dependencies).

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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

Status in “libdrm” package in Ubuntu:
  New
Status in “xserver-xorg-video-intel” 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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