Public bug reported:

Start gnome-display-properties on a RS480 ati chipset with 2 monitors
connected to the machine, click the mirror check box and it will crash.

$ gnome-display-properties

(gnome-display-properties:3797): Gtk-WARNING **: Ignoring the separator
setting

(gnome-display-properties:3797): Gtk-WARNING **: No object called: 
**
display-properties:ERROR:xrandr-capplet.c:643:rebuild_resolution_combo: code 
should not be reached
Aborted (core dumped)

lspci output
01:05.0 VGA compatible controller: ATI Technologies Inc RS480 [Radeon Xpress 
200G Series]

$xrandr 
Screen 0: minimum 320 x 200, current 1920 x 1200, maximum 1920 x 1920
VGA-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm 
x 268mm
   1920x1080      60.0*+
   1600x1200      60.0  
   1680x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       60.0  
   1280x800       59.8  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
DVI-0 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 519mm 
x 324mm
   1920x1200      60.0*+
   1600x1200      60.0  
   1680x1050      59.9  
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1024x768       75.0     60.0  
   800x600        75.0     60.3  
   640x480        75.0     59.9  
   720x400        70.1  
S-video disconnected (normal left inverted right x axis y axis)

** Affects: ubuntu
     Importance: Undecided
         Status: New

-- 
gnome-display-properties core dump when setting mirror mode
https://bugs.launchpad.net/bugs/428351
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