https://bugs.freedesktop.org/show_bug.cgi?id=41265
--- Comment #26 from Alex Deucher agd5f@yahoo.com 2012-08-10 13:50:54 UTC --- (In reply to comment #25)
i don't know why, but it don't get the VFCT Table. this returns false: (!ACPI_SUCCESS(acpi_get_table("VFCT", 1, &hdr)))
Then your system doesn't have the table.