Adding "1680x1050" manually to the xorg.conf does help on my 7.04 Beta install. However, I just downloaded the Feisty i386 Desktop livecd for today [1] and the screen resolution is still coming back as 1024x768 when I boot using that livecd.
[1] - http://cdimage.ubuntu.com/daily-live/20070401/feisty- desktop-i386.iso -- Full screen resolution not used on LC2440N Linux Certified laptop. https://launchpad.net/bugs/99126 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs