F10: can't get dual-head working

[Ron Siven]

Dave Mitchell wrote:
> 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)
>
>
>   
This helped me:

http://www.thinkwiki.org/wiki/Xorg_RandR_1.2