Comment 81 for bug 881046

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In , Harald Judt (hjudt) wrote :

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.