This sounds like it's caused by bug 203369, caused by a typo.
Can you please try the fix provided there?
** Changed in: acpi-support (Ubuntu)
Importance: Undecided => Medium
Assignee: (unassigned) => Daniel Hahler (blueyed)
Status: New => Incomplete
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acpi-support 0.106 leads to kernel panic (0.105 don't)
https://bugs.launchpad.net/bugs/203189
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