Public bug reported:

Binary package hint: xorg

1) Ubuntu Intrepid Ibex Alpha 2
2) Unsure of correct name but there is no ambiguity about what is being used
3)Select System>Preferences>Screen Resolution (Gnome-display-manager)
Untick cloned
Rearrange monitors so second monitor is to right of first monitor
Try any combination of screen resolutions
Click either of two options (keep resolution/use new resolution)
System likely to hang completely

Extra info:
lspci -nn | grep VGA
01:00.0 VGA compatible controller [0300]: ATI Technologies Inc RV350 AP [Radeon 
9600] [1002:4150]

xrandr
Screen 0: minimum 320 x 200, current 1680 x 1024, maximum 1680 x 1200
VGA-0 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 360mm 
x 270mm
   1600x1200      75.0 +   75.0     75.0     70.0     65.0     60.0  
   1680x1050      84.9     74.9     69.9     60.0  
   1600x1024      60.2  
   1400x1050      85.0     74.8     70.0     60.0  
   1280x1024      85.0     85.0     75.0     60.0* 
   1440x900       59.9  
   1280x960       85.0     60.0  
   1360x768       59.8  
   1152x864      100.0     85.1     85.0     75.0     75.0     70.0     60.0  
   1024x768       85.0     85.0     75.1     75.0     70.1     60.0     43.5  
   832x624        74.6  
   800x600        85.0     85.1     72.2     75.0     60.3     56.2  
   640x480        85.0     85.0     75.0     72.8     72.8     75.0     66.7    
 60.0     59.9  
   720x400        87.8     85.0     70.1  
   640x400        85.1  
   640x350        85.1  
DVI-0 connected (normal left inverted right x axis y axis)
   1280x1024      60.0 +   60.0     60.0  
   1600x1024      60.2  
   1440x900       59.9  
   1280x960       60.0     60.0  
   1360x768       59.8  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        60.0     59.9  
   720x400        70.1  
S-video disconnected (normal left inverted right x axis y axis)

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

-- 
Setting non-cloned dual monitor screen resolutions hangs system
https://bugs.launchpad.net/bugs/248244
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