I make further investigations and try with this xorg.conf:

Section "Monitor"
        Identifier      "Configured Monitor"
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Monitor         "Configured Monitor"
        Device          "Configured Video Device"
EndSection

Section "Device"
        Identifier      "Configured Video Device"
        Driver          "ati"
        Option          "DRI" "false"
EndSection

Then everything is working like before.
I think it is a dri issue on my HD3200.

-- 
fails after login in gdm
https://bugs.launchpad.net/bugs/421222
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