linux-kernel - Re: [PATCH v5] platform/x86: lg-laptop: Fix WMAB call in fan_mode

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Message-Id: <175871961048.19584.6234729612579222383.b4-ty@linux.intel.com>
Date: Wed, 24 Sep 2025 16:13:30 +0300
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Daniel <dany97@...e.ca>
Cc: Markus.Elfring@....de, hansg@...nel.org, 
 LKML <linux-kernel@...r.kernel.org>, matan@...alib.org, 
 platform-driver-x86@...r.kernel.org
Subject: Re: [PATCH v5] platform/x86: lg-laptop: Fix WMAB call in
 fan_mode_store()

On Tue, 23 Sep 2025 09:19:39 -0400, Daniel wrote:

> On my LG Gram 16Z95P-K.AA75A8 (2022), writes to
> /sys/devices/platform/lg-laptop/fan_mode have no effect and reads always
> report a status of 0.
> 
> Disassembling the relevant ACPI tables reveals that in the WMAB call to
> set the fan mode, the new mode is read either from bits 0,1 or bits 4,5
> (depending on the value of some other EC register).  Thus when we call
> WMAB twice, first with bits 4,5 zero, then bits 0,1 zero, the second
> call undoes the effect of the first call.
> 
> [...]


Thank you for your contribution, it has been applied to my local
review-ilpo-fixes branch. Note it will show up in the public
platform-drivers-x86/review-ilpo-fixes branch only once I've pushed my
local branch there, which might take a while.

The list of commits applied:
[1/1] platform/x86: lg-laptop: Fix WMAB call in fan_mode_store()
      commit: bab04f0166dfaf7d7dfb5fd96d8f961a1b4e1b2c

--
 i.