[coreboot - Bug #533] T440p audio mute button and fan control not working

[frantic from xboot]

Issue #533 has been updated by frantic from xboot.

Evgeny Zinoviev wrote in #note-13:
> For everyone who encounters this issue - I just found another workaround:
>
> just pass `force_load=1` to thinkpad_acpi module.

PS. That only works once you've fixed the SMBIOS tables.

----------------------------------------
Bug #533: T440p audio mute button and fan control not working
https://ticket.coreboot.org/issues/533#change-1821

* Author: frantic from xboot
* Status: Resolved
* Priority: Normal
* Target version: master
* Start date: 2024-03-07
* Affected versions: master
* Affected hardware: Lenovo Thinkpad T440p
* Affected OS: All Linux distributions
----------------------------------------
In recent coreboot versions, the audio mute button and fan control has stopped working. Whereas you use the same revision from Libreboot, it all works fine and smoothly. This leads me to suspect that someone changed someone without testing, which is real annoying.
The audio mute button technically still functions, but the LED no longer turns on/off. Always just off.
Fan control no longer works with Thinkfan. /proc/acpi/ibm/fan doesn't exist any more. I've tried "force loading" thinkpad_acpi, but it doesn't work.