xrandr scale factor smaller than 1 has same effect as 1

$ubuntu-bug xrandr -> package xrandr does not exist

hmm..

when I do this:

xrandr --output LVDS1 --scale 0.8x0.8

the screen is shown 'zoomed in' initially but when the mouse hits the side of the screen (and I expect it to pan),
the screen zooms out again (probably to 'scale 1)

Just discovered one more thing: if the mouse arrow is placed near the top or left side of the screen when trying to zoom, the screen is shown zoomed initially, and the scale factor goes back to 1 when the arrow hits an edge. But if the arrow is near the bottom or right edge of the screen when trying to zoom, the scale factor stays one when trying to zoom. (thoug the screen is shown garbled near the edge then)

The output of xrandr before and after this is the same.
......

jos@hpux:~$ lsb_release -rd
Description: Ubuntu 13.04
Release: 13.04

jos@hpux:~$ apt-cache policy xorg
xorg:
  Installed: 1:7.7+1ubuntu4
  Candidate: 1:7.7+1ubuntu4
  Version table:
 *** 1:7.7+1ubuntu4 0
        500 http://nl.archive.ubuntu.com/ubuntu/ raring/main amd64 Packages
        100 /var/lib/dpkg/status