F10: can't get dual-head working

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I have a laptop with F10, and am trying to get an external VGA LCD panel to
work (in a dual-head setting).

I did the following:

* login using gnome
* attach + power up monitor (it goes into 'no-signal' power save mode)
* Fire up gnome-display-properties (System > Preferences > Hardware >
  Screen Resolution)

It detects the external monitor; I select it, change its resolution from
'off' to '1440x900', click apply, and the monitor resolutely stays in
power save mode.

Also, quitting then restarting gnome-display-properties shows the
monitor's resolution setting has switched back to 'off'.

Any suggestions?

It's a Dell 640m laptop with Intel 945GM graphics.

xrandr shows:

Screen 0: minimum 320 x 200, current 1440 x 900, maximum 1440 x 1440
VGA connected (normal left inverted right x axis y axis)
   1440x900       59.9 +   75.0     59.9  
   1400x1050      60.0  
   1280x1024      75.0     60.0  
   1280x960       60.0  
   1152x864       75.0  
   1024x768       75.0     70.1     60.0  
   832x624        74.6  
   800x600        72.2     75.0     60.3     56.2  
   640x480        75.0     72.8     75.0     66.7     59.9  
   720x400        70.1  
LVDS connected 1440x900+0+0 (normal left inverted right x axis y axis) 300mm x 190mm
   1440x900       60.0*+
   1024x768       60.0  
   800x600        60.3  
   640x480        59.9  
TV disconnected (normal left inverted right x axis y axis)


-- 
A walk of a thousand miles begins with a single step...
then continues for another 1,999,999 or so.

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