** Changed in: linux (Ubuntu Jammy)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: In Progress => Invalid
** Changed in: linux (Ubuntu Jammy)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/2031333
Title:
Need to get fine-grained control for FAN(TFN) Participant.
Status in linux package in Ubuntu:
Invalid
Status in linux source package in Jammy:
Fix Committed
Bug description:
This is a public version of the following bugs:
https://bugs.launchpad.net/bugs/1987597
https://bugs.launchpad.net/bugs/2027754
----------------
[Feature Description]
We need Fine-grained Control of TFN participant for enabling active 2 policy
in Linux/chrome.
Currently, The kernel has provided __FPS table and cur__state to
adjust the fan level as per _FPS table .
But there is no option to read *_FIF (Fan Information) and _FST (Fan
Status).*
Once the fine-grained control is enabled, we should be able to the set
the control value from 0-100 through Arg0 of _FSL (Fan Set Level).
*_FST (Fan Status)* should report current running RPM and control
value of the FAN(TFN).
please refer ACPI spec for more detail.
[https://uefi.org/specs/ACPI/6.4/11_Thermal_Management/fan-
device.html]
[HW/SW Information]
Hardware: Alder Lake
Target Release: 22.04
Target Kernel: 5.15
Merged for 5.18-rc1
f1197343f077 ACPI: fan: Add additional attributes for fine grain control
bea2d9868ef5 ACPI: fan: Properly handle fine grain control
d445571fa369 ACPI: fan: Optimize struct acpi_fan_fif
00ae053a0533 ACPI: fan: Separate file for attributes creation
Platform-independent
[Business Justification]
Function enabling
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