acer-wmi broken in latest git kernel on TravelMate 6492 (Insufficientarguments - method [WQAA])

[Sven Wegener]

Hi all,

running Linus' latest (2b12a4c) git kernel, acer-wmi triggers the 
following ACPI Error on my Acer TravelMate 6492:

acer-wmi: Acer Laptop ACPI-WMI Extras
ACPI Error (nseval-0159): Insufficient arguments - method [WQAA] needs 1, found 0 [20080609]
acer-wmi: Unable to detect available WMID devices

Reverting commit f3454ae8104efb2dbf0d08ec42c6f5d0fe9225bc (ACPICA: Add 
argument count checking to control method invocation via 
acpi_evaluate_object) makes acer_wmi work as before.

Doing a little debugging the call trace starting at acer_wmi_init() is:

WMID_set_capabilities() (called from drivers/misc/acer-wmi.c:1192)
wmi_query_block(WMID_GUID2, 1, &out) (called from drivers/misc/acer-wmi.c:747)
acpi_evaluate_object(handle, method, NULL, out) (called from drivers/acpi/wmi.c:350)
acpi_ns_evaluate(info) (called from drivers/acpi/namespace/nsxfeval.c:258)

Is it a bug in acer-wmi or in Acer's ACPI implementation? I can provide 
more information as necessary.

Sven
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