I too can confirm that scaling doesn't work with radeon.

On a laptop with intel driver, the following works fine, except the mouse 
pointer is confined to the mode area, but I believe that is a known xorg-server 
bug:
xrandr --fb 1920x1080 --output eDP1 --mode 1600x900 --scale-from 1920x1080

The same command, adapted to the radeon output device doesn't work. Same
software configuration (xorg-1.15.99.903, libdrm-git, mesa-git, xf86
-video-ati-git, various kernel versions (at the moment 3.15.2)). Screen
rotation does work, though.

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https://bugs.launchpad.net/bugs/881046

Title:
  Panning in a virtual monitor is not possible after upgrade to Ubuntu
  11.10

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