PARTIALLY RESOLVED! Ok I've found which is the EVIL option which causes this issue: the local APIC support! in fact if I boot with "nolapic" option the issue is definitely gone!
** Changed in: linux-source-2.6.19 (Ubuntu)
Status: Unconfirmed => Confirmed
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Asus laptop hangs on TFT/VGA video switch (Fn-F8)
https://launchpad.net/bugs/36885
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