this problem is also known here http://acpi4asus.sourceforge.net/README
"Debugging:
1) Check whether the Fn+F8 key:
a) does not lock the laptop (try disabling CONFIG_X86_UP_APIC or boot with
noapic / nolapic if it does)"
maybe you can try to contact the acpi4asus maintainer to have additional
information...
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Asus laptop hangs on TFT/VGA video switch (Fn-F8)
https://launchpad.net/bugs/36885
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