Created attachment 73298 [details]
Log file containing backtrace

Hi, 

On a fresh install of Ubuntu 12.10, using the (default) nouveau graphics
driver, I am able to crash the display manager by moving any window outside the
screen area.

Using other graphics-drivers (nvidia proprietary), there are no problems with
having windows outside the screen area. 


I've attached a the Xorg.0.log logfile which contains a backtrace. 

My graphics card is an NVidia GeForce GTX 660 Ti Amp Edition. 


Please let me know if you need any other log-files from the system. 


Thanks