I have exactly the same Acer TravelMate 634 as the original poster. My system behaved exactly the same. I was able to stop the hanging by using the kernel parameter nohz=off (no other acpi/apic related parameters). I hope this helps.
I have exactly the same Acer TravelMate 634 as the original poster. My system behaved exactly the same. I was able to stop the hanging by using the kernel parameter nohz=off (no other acpi/apic related parameters). I hope this helps.