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Unverified Commit 2b9f84e7 authored by Eduard Christian Dumitrescu's avatar Eduard Christian Dumitrescu Committed by Ilpo Järvinen
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platform/x86: thinkpad_acpi: disable ACPI fan access for T495* and E560



T495, T495s, and E560 laptops have the FANG+FANW ACPI methods
(therefore fang_handle and fanw_handle are not NULL) but they do not
actually work, which results in a "No such device or address" error.
The DSDT table code for the FANG+FANW methods doesn't seem to do
anything special regarding the fan being secondary. The bug was
introduced in commit 57d0557d ("platform/x86: thinkpad_acpi: Add
Thinkpad Edge E531 fan support"), which added a new fan control method
via the FANG+FANW ACPI methods.

Add a quirk for T495, T495s, and E560 to avoid the FANG+FANW methods.
Fan access and control is restored after forcing the legacy non-ACPI
fan control method by setting both fang_handle and fanw_handle to NULL.

Reported-by: default avatarVlastimil Holer <vlastimil.holer@gmail.com>
Fixes: 57d0557d ("platform/x86: thinkpad_acpi: Add Thinkpad Edge E531 fan support")
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219643


Cc: stable@vger.kernel.org
Tested-by: default avatarAlireza Elikahi <scr0lll0ck1s4b0v3h0m3k3y@gmail.com>
Reviewed-by: default avatarKurt Borja <kuurtb@gmail.com>
Signed-off-by: default avatarEduard Christian Dumitrescu <eduard.c.dumitrescu@gmail.com>
Co-developed-by: default avatarSeyediman Seyedarab <ImanDevel@gmail.com>
Signed-off-by: default avatarSeyediman Seyedarab <ImanDevel@gmail.com>
Link: https://lore.kernel.org/r/20250324152442.106113-1-ImanDevel@gmail.com


Reviewed-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
parent 7b98c1c8
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