Solved !
I changed the boot options to : pnpbios=off irqpoll
and it solved the IRQ conflict
Looks like it was a hardware problem, not related to the 
xserver-xorg-video-intel package

Thanks Peter anyway,
keep up the good work !

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Incomplete => Fix Committed

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[gutsy] performance regression with i915 xorg driver (glxgears in liveCD or 
after HD install) 
https://bugs.launchpad.net/bugs/155985
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