Public bug reported:

I had 11.10 64bit, I upgraded to 12.04

if I change the settings in the Display it will freeze .
-  if I move the external monitor  to the left of laptop monitor , (or above 
it) it will freeze
 - if I try to turn of the laptop monitor ,so I only have my external monitor 
it will freeze again.

the mouse wont move and I have to reset the computer by ALT PRINT K to
come back to ubuntu

dual monitor used to work fine in ubuntu 11.10 , is there any way to
downgrade the Display program to the one in 11.10 ?

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: 12.04 display dual monitor ubuntu

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https://bugs.launchpad.net/bugs/992778

Title:
  Dual Monitor Freeze after changing Display Settings in ubuntu 12.04

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