This morning I've tested a daily vuild with xorg 7.2 and the problem
doesn't seem to be fixed.

However, I have foud the cause of the problem. As a matter of fact, xorg
doesn't detect my graphic card. I could see it with a sudo dpkg-
reconfigure xserver-xorg. Reconfiguring xorg with nv (it seemed to use
vesa before or a failsafe mode, it even didn't detect the touchpad) fix
it and all works fine.

To put it in a nutshell : - the graphic card isn't detected, so xorg seems to 
use a failsafe mode (maybe vesa, without touchpad support, with a wrong 
resolution and a slow display)
- sudo dpkg-reconfigure xserver-xorg fixes the prolem and the screen resolution 
is well detected by xorg after (the touchpad works very well after that)

I hope it will help you.

-- 
Wrong resolution with an nvidia GeForceGo 7300
https://launchpad.net/bugs/79016

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