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

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Message-ID: <20180621113739.24smnyxma2g2yjdt@pali>
Date:   Thu, 21 Jun 2018 13:37:39 +0200
From:   Pali Rohár <pali.rohar@...il.com>
To:     Alex Hung <alex.hung@...onical.com>
Cc:     Pavel Machek <pavel@....cz>,
        Henrique de Moraes Holschuh <hmh@....eng.br>,
        Henrique de Moraes Holschuh <ibm-acpi@....eng.br>,
        Takashi Iwai <tiwai@...e.de>,
        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 Monday 18 June 2018 12:11:44 Pali Rohár wrote:
> 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.

Hi Alex, do you have other details or documentation for your patch
"thinkpad_acpi: added BIOS mute interfaces for volume" (linked above)
which you sent to platform-driver-x86 list 6 years ago?

It calls SHDA thinkpad ACPI function and I would like to know more what
is this function doing...

-- 
Pali Rohár
pali.rohar@...il.com