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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