moddifing this par of my Xorg.conf solve my problem
Section "Device"
Identifier "Configured Video Device"
BusID PCI:0:2:1
EndSection
it seem that it is a problem in hardware detection or some think like that
thank for your help
** Changed in: gdm (Ubuntu)
Assignee: (unassigned) => AtomCell (shelhatem)
Status: New => Fix Committed
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Big User name and password font size on login screen
https://bugs.launchpad.net/bugs/301135
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