Further information.  When I set resolutions to 1280x1024 and 1280x800
xrandr reports

~$ xrandr
Screen 0: minimum 320 x 200, current 2048 x 768, maximum 4096 x 4096
VGA1 connected 1280x1024+1280+0 (normal left inverted right x axis y axis) 
338mm x 270mm
   1280x1024      60.0*+   75.0  
   1152x864       75.0  
   1024x768       75.1     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   640x480        72.8     75.0     66.7     60.0  
   720x400        70.1  
LVDS1 connected 1280x800+0+224 (normal left inverted right x axis y axis) 331mm 
x 207mm
   1280x800       60.0*+
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
TV1 disconnected (normal left inverted right x axis y axis)

The current size for Screen 0 is shown as  2048x768.  I think possibly
it should be 2560x1024.

-- 
Dual head problem - can't use both monitors fully
https://bugs.launchpad.net/bugs/644359
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