If I stop compiz then problem disapear
it means:
using gnome-display-properties problem seen
switching off compiz
using gnome-display-properties problem not seen

with compiz doing
xrandr -s 0 
clear the problem

For EXA
edited /etc/X11/xorg.conf
put     Option "AccelMethod" "EXA"
restart X11
  cat /var/log/Xorg.0.log | grep EXA
(**) RADEON(0): Option "AccelMethod" "EXA"
(**) RADEON(0): Using EXA acceleration architecture
(==) RADEON(0): Not using accelerated EXA DownloadFromScreen hook
(II) RADEON(0): Setting EXA maxPitchBytes
(II) EXA(0): Offscreen pixmap area of 24526848 bytes
(II) EXA(0): Driver registered support for the following operations:

problem reproducible with EXA

-- 
Radeon 9200 cannot properly reset screen to 1280x800
https://bugs.launchpad.net/bugs/291571
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