I can force the setting by type:
xrandr --newmode "1440x900" 106.50 1440 1528 1672 1904 900 903 909 934 -Hsync 
+Vsync
xrandr --addmode VGA-1 1440x900
xrandr --output VGA-1 --mode 1440x900

but gdm reset it to 1024x768, except I write is into gdm initial script

-- 
[ubuntu 10.10 rc] nouveau  set wrong resolution
https://bugs.launchpad.net/bugs/655790
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which is subscribed to xserver-xorg-video-nouveau in ubuntu.

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