For months I've been living with a 1024x768 screen size on a 1366x768-pixel screen after a system upgrade, and not wanting to wade through all the obsolete advice found on Google. Finally I tried again last night and got it working with this:

jcomeau@intrepid:~$ cat /usr/share/X11/xorg.conf.d/20-ati.conf 
Section "Device"
    Identifier  "ati"
    Driver      "radeon"
    VideoRam    16384

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last updated 2012-12-05 00:48:29. served from tektonic.jcomeau.com