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Re: F10: can't get dual-head working



On Fri, Feb 13, 2009 at 10:54:23AM -0600, Ron Siven wrote:
> 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

Ah thanks.

For the record, my problem was due to insufficient virtual screen size.

I created a minimal /etc/X11/xorg.conf to set a virtual screen big enough
for two 1440x900 displays stacked vertically:

Section "Screen"
        Identifier      "Default Screen"
        Device          "Configured Video Device"
        DefaultDepth    24
        SubSection "Display"
            Depth           24
            Virtual         1400 1800
        EndSubSection
EndSection

Logged back in, and now it works (modulo gnome panels being screwed up in
various unamusing ways).

-- 
You live and learn (although usually you just live).


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