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[Benoit Grégoire <benoitg@xxxxxxxx>]

Ok, test results.  Ran on Thinkpar T510 (Optimus graphics).  BIOS config
is either Integrated graphics (Intel) or Discrete (Nvidia).  The nouveau
open source driver is used for nvidia configurations.  This is on latest
natty.

BIOS;  Dock config => Results
1- Integrated Graphics; In dock at boot, single screen => gitk works
2- Integrated Graphics; In dock at boot, two screens => gitk works
3- Discrete Graphics; In dock at boot, two screens => X crashes completely (back to login screen)
4- Discrete Graphics; In dock only after X starts, two screens configured with xrandr => X freezes (Image is frozen but cursor still follows mouse movements)
5- Discrete Graphics; In dock at boot, removed from dock after X starts, reconfigure to single screen with xrandr => X freezes (Image is frozen but cursor still follows mouse movements)

I've had similar symptoms at other times, but I only identified gitk as
consistently triggering the bug.

In any event, this il definitely:
-Related to multi-screen configurations
-Doesn't occur on i965 driver
-Aparently common to both closed nvidia driver and open nouveau driver.

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https://bugs.launchpad.net/bugs/659473

Title:
  gitk crashes entire X session