Você pode tentar instalar o mesa-7.10 que se encontra no /testing, ou fazer 
um downgrade pro 7.8.2 que está no /pastures
Aki está um link para a 
pagina<http://alien.slackbook.org/blog/compositing-hard-lock-in-kde-4-5/>do 
Eric, talvez tu ache ali a solução, ou
estou colando uma parte do Changelog pra você ler.


Sun Nov 14 23:58:42 UTC 2010
I was on the fence with this upgrade, and in fact it sat in /testing for
  days with mesa-7.8.2 queued instead.  But it seems the Intel driver really
  does need this version of Mesa or there are major problems with 
compositing
  (most of them leading to an X server crash).
  If X crashes at start, try disabling compositing.  Create a file named
  /etc/X11/xorg.conf.d/disable-composite.conf with this in it:
    Section "Extensions"
      Option "Composite" "Disable"
    EndSection
  The machine that had issues here was using an onboard nVidia 6150SE.
  Using the nv, nouveau, or even the vesa driver, X crashed at start unless
  compositing was disabled.  However, everything works perfectly when using
  the binary nVidia drivers, and odds are that most users with decent nVidia
  hardware are doing just that.  So, that's the situation with nVidia and
  Mesa as observed here for now.  Hopefully the defaults will work better
  soon, but meanwhile if you have nVidia hardware you may have to either
  disable compositing or obtain and use nVidia's binary drivers.

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