Had the same problem with a toshiba satellite pro 4600 and lucid. I only had to 
generate a fresh xorg.conf with :
sudo X -configure
sudo mv ~/xorg.conf.new /etc/X11/xorg.conf

Edit this file to modify the monitor section :
Section "Monitor"
Identifier "Configured Monitor"
Option "DPMS" "true"
HorizSync 30.0-60.0
VertRefresh 50.0-70.0
EndSection

and restart X (reboot the computer).

The bug come from a too low hsync value for this (not recognized)
screen. I don't think it would be a trident-specific issue.

** Tags added: lucid

-- 
display limited to 800 X 600 - won't fill screen
https://bugs.launchpad.net/bugs/501607
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