Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux

ACPI: OSI: Stop advertising support for "3.0 _SCP Extensions"

As specified in section 5.7.2 of the ACPI specification the feature
group string "3.0 _SCP Extensions" implies that the operating system
evaluates the _SCP control method with additional parameters.

However the ACPI thermal driver evaluates the _SCP control method
without those additional parameters, conflicting with the above
feature group string advertised to the firmware thru _OSI.

Stop advertising support for this feature string to avoid confusing
the ACPI firmware.

Fixes: e5f660ebef68 ("ACPI / osi: Collect _OSI handling into one single file")
Signed-off-by: Armin Wolf <W_Armin@gmx.de>
Link: https://patch.msgid.link/20250410165456.4173-2-W_Armin@gmx.de
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

authored by

Armin Wolf and committed by
Rafael J. Wysocki
8cf4fdac 82f2b0b9

-1
-1
drivers/acpi/osi.c
··· 42 42 osi_setup_entries[OSI_STRING_ENTRIES_MAX] __initdata = { 43 43 {"Module Device", true}, 44 44 {"Processor Device", true}, 45 - {"3.0 _SCP Extensions", true}, 46 45 {"Processor Aggregator Device", true}, 47 46 }; 48 47