I have had a similar problem as the one stated here and would like to
share how I got it solved. My problem was that the graphics card only
could go as hi as 800x600 in resolution although the laptop LCD is
1024x768.

After days of googling and trial and error I discovered that there seems
to be a important relationship between the resolution the xorg engine
can activate and the HorizSync and VertRefresh rates entered.

The issue got solved when I tried the following entry in my xorg.conf
file. Mind you I entered nothing else just this:

Section "Monitor"
    Identifier   "Generic Monitor"
    Option       "DPMS"
    HorizSync    31.5-55
    VertRefresh  40-70
EndSection

I hope it will solve your problem as well.

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Dell Inspiron 8000 split screen with ATI Mobility 4 display adapter
https://bugs.launchpad.net/bugs/257475
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