linux-kernel - Re: ThinkPad T480s & LED_MUTE, LED

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Date:   Mon, 18 Jun 2018 12:11:44 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Henrique de Moraes Holschuh <hmh@....eng.br>,
        Takashi Iwai <tiwai@...e.de>
Cc:     Pavel Machek <pavel@....cz>,
        Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
        ibm-acpi-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: ThinkPad T480s & LED_MUTE, LED_MICMUTE

On Friday 15 June 2018 20:36:28 Henrique de Moraes Holschuh wrote:
> On Fri, 15 Jun 2018, Pali Rohár wrote:
> > means set. What is SHDA doing, I have not figured out. It does not
> 
> Look at the HDA mixer state, SHDA is likely to be directly messing with
> it.

Now I found following email thread between you and Alex with patch which
configures HDA mixer via that SHDA method:

https://www.spinics.net/lists/platform-driver-x86/msg03206.html

But looks like that patch was never included into mainline kernel...

Seems it would be needed in some part (to not break older Thinkpads) for
that LED support in alsa mixer about which Takashi Iwai wrote.

-- 
Pali Rohár
pali.rohar@...il.com