First, I opened an upstream bug related to this issue:

https://bugs.freedesktop.org/show_bug.cgi?id=13590

Also, this didn't have an effect. In fact, I changed it to:

Virtual         1280    1024

However, I'm still seeing the "1: Analog Input Cannot Display This Video
Mode" on VGA-0. The following command still "moves" the working screen
from DVI-0 to VGA-0:

xrandr --output DVI-0 --crtc 0 --output VGA-0 --crtc 1

Here is the output of an "xrandr -q" command:

Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 1280 x 1024
VGA-0 connected 1280x1024+0+0 (normal left inverted right) 376mm x 301mm
   1280x1024      60.0*+   75.0     59.9  
   1152x864       74.8  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   640x480        75.0     60.0  
   720x400        70.1  
DVI-0 connected 1280x1024+0+0 (normal left inverted right) 376mm x 301mm
   1280x1024      60.0*+   75.0     59.9  
   1152x864       74.8  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   640x480        75.0     60.0  
   720x400        70.1  
LVDS connected (normal left inverted right)
   1280x1024      59.9  
   1280x800       60.0  
   1280x768       60.0  
   1024x768       60.0  
   800x600        60.3  
   640x480        59.9  
S-video disconnected (normal left inverted right)

The attached log is from this attempt.

** Attachment added: "Log when virtual was changed to 1280x1024"
   http://launchpadlibrarian.net/10833477/Xorg.0.log

-- 
Dual-head fails with ati driver, appears related to 'crtc'
https://bugs.launchpad.net/bugs/172601
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