Am 10.04.25 um 18:54 schrieb Armin Wolf:
The ACPI specification defines an interface for the operating system
to change the preferred cooling mode of a given ACPI thermal zone.
This interface takes the form of a special ACPI control method called
_SCP (see section 11.4.13 for details) and is already supported by the
ACPI thermal driver.
However this support as many issues:
- the kernel advertises support for the "3.0 _SCP Extensions" yet the
ACPI thermal driver does not support those extensions. This may
confuse the ACPI firmware.
- the execution of the _SCP control method happens after the driver
retrieved the trip point values. This conflicts with the ACPI
specification:
"OSPM will automatically evaluate _ACx and _PSV objects after
executing _SCP."
- the cooling mode is hardcoded to active cooling and cannot be
changed by the user.
Those issues are fixed in this patch series. In the end the user
will be able to tell the ACPI firmware wether he prefers active or
passive cooling. This setting will also be interesting for
applications like TLP (https://linrunner.de/tlp/index.html).
The whole series was tested on various devices supporting the _SCP
control method and on a device without the _SCP control method and
appears to work flawlessly.
Any updates on this? I can proof that the new interface for setting the cooling mode
works. Additionally the first two patches fix two issues inside the underlying code
itself, so having them inside the mainline tree would be beneficial to users.
Thanks,
Armin Wolf
Armin Wolf (3):
ACPI: OSI: Stop advertising support for "3.0 _SCP Extensions"
ACPI: thermal: Execute _SCP before reading trip points
ACPI: thermal: Allow userspace applications to change the cooling mode
.../ABI/testing/sysfs-driver-thermal | 14 ++
MAINTAINERS | 1 +
drivers/acpi/osi.c | 1 -
drivers/acpi/thermal.c | 129 ++++++++++++++++--
4 files changed, 133 insertions(+), 12 deletions(-)
create mode 100644 Documentation/ABI/testing/sysfs-driver-thermal
--
2.39.5
