You probably need to force the higher resolution, then.  You may be able to use the monitor resolution configuration tool to get a higher res,
or you may need to hand-modify an xorg.conf file to set the resolution to the native resolution of your LCD panel.

Mike Hoy wrote:
>> The xrandr output you give here shows the laptop screen still enabled.
>> Are you getting the higher resolution of the 22" screen after disabling the
>> laptop screen, or is it still limiting you to what a dual-screen setup
>> permits?
>>
> After disabling the laptop monitor resolution stays the same.
> 
> 
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