Lock-out after login

[antonio montagnani]

I upgraded a perfect F14 to F15 on a Samsung laptop, with intel i915 
graphics.
After upgrading all packages (but Xorg-x11-server that coould be started 
only with nomodeset option) randomly at boot laptop seems to freeze, as 
in some protection state, afterwards I push the power button and I get 
the login screen.

Any idea??
-- 
Antonio M
Skype: amontag52

Linux Fedora F15 (Lovelock) on Acer 5720

http://lugsaronno.altervista.org
www.campingmonterosa.com
www.studiodacolpaloschi.it