Well, this I ripped off from a Slashdot post a while ago to make fonts look nicer, but it should also fix the weird resolutions problem:
Configure X and Gnome to 96 dpi sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.bak sudo gedit /etc/X11/xorg.conf Locate Section "Monitor" and add the following lines before EndSection: # DisplaySize 270 203 # 1024x768 96dpi # DisplaySize 338 254 # 1280x960 96dpi # DisplaySize 338 270 # 1280x1024 96dpi # DisplaySize 370 277 # 1400x1050 96dpi # DisplaySize 423 370 # 1600x1400 96dpi Uncomment the line corresponding to your current resolution. To get other values, use the following formula: displaysize = {pixelsize}/96*25.4 Remember: The display size must be "right" so adjust those values till you get your size right.