On Sat, Apr 26, 2025 at 1:20 AM Armin Wolf <W_Armin@xxxxxx> wrote: > > 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. Sure. I'm going to get to them next week, probably on Monday.
