Fabio:
I tryed your suggestion 
xrandr --verbose --output LVDS --off
xrandr --verbose --output VGA --off
(before the line to change resolution.)

but I cannot confirm it to work.
Disabled my displays and because setting resolutioon after disabling displays 
wasnt accepted. So configuration reverted to displays off. Had to restart X.

-- 
xrandr: Configure crtc 0 invalid time
https://bugs.launchpad.net/bugs/394490
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