Here is more info about my system:

laptop:~$ lspci|grep VGA
01:05.0 VGA compatible controller: ATI Technologies Inc Radeon IGP 
330M/340M/350M

laptop:~$ sudo ddcprobe

vbe: VESA 2.0 detected.
oem: ATI RS200M
memory: 20416kb
mode: 320x200x32k
mode: 320x200x64k
mode: 320x200x16m
mode: 1600x1200x256
mode: 640x400x256
mode: 640x480x256
mode: 640x480x32k
mode: 640x480x64k
mode: 640x480x16m
mode: 1600x1200x32k
mode: 800x600x256
mode: 800x600x32k
mode: 800x600x64k
mode: 800x600x16m
mode: 1600x1200x64k
mode: 1024x768x256
mode: 1024x768x32k
mode: 1024x768x64k
mode: 1024x768x16m
mode: 1280x1024x256
mode: 1280x1024x32k
mode: 1280x1024x64k
mode: 1280x1024x16m
edid: 
edidfail

laptop:~$ xrandr
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 1280 x 1200
VGA-0 connected (normal left inverted right x axis y axis)
   1280x1024      75.0 +   74.9     75.0  
   1152x864       75.0  
   1024x768       84.9     75.1     70.1     60.0     43.5  
   832x624        74.6  
   800x600        84.9     72.2     75.0     60.3     56.2  
   640x480        84.6     75.0     72.8     66.7     60.0  
   720x400        87.8     70.1  
LVDS connected 1024x768+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1024x768       60.0*+   60.0  
   800x600        60.3  
   640x480        59.9  
S-video disconnected (normal left inverted right x axis y axis)
laptop:~$ 


** Description changed:

  Binary package hint: xserver-xorg-driver-ati
  
  ATI IGP 340M video card.
  
  Under Gutsy, I could use xrandr to switch between LVDS and VGA-0. When I
  upgraded to Hardy, I can not get VGA-0 to display.
  
  Details: During boot up, I can see all images. I forced the "vesa"
  driver in lo-res mode and it was able to display to my external monitor
  (VGA-0). Once gdm loads, the external monitor goes into standby (i.e.,
  the display goes dark and the power LED blinks). No combination of
- xorg.conf and xrandr options has given me a display.
+ xorg.conf and xrandr options has given me a display when using the ati
+ driver.

-- 
ati driver will not turn on external display
https://bugs.launchpad.net/bugs/231081
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