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

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Message-ID: <20180615112606.GA3986@amd>
Date:   Fri, 15 Jun 2018 13:26:06 +0200
From:   Pavel Machek <pavel@....cz>
To:     Pali Rohár <pali.rohar@...il.com>
Cc:     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

Hi!

> Hi! With up-to-date thinkpad_acpi.ko driver on ThinkPad T480s I'm seeing
> a strange behavior of LEDs which are integrated into mic mute (Fn+F4)
> and mute (Fn+F1) keys.
> 
> When thinkpad_acpi.ko is not loaded, then mute key is working fine. When
> pressed, it correctly generates KEY_MUTE on AT Translated Set 2 keyboard
> input device and also turn on/of mute led. But when micmute key is
> pressed then, nothing happen. No key event is reported and also led is
> not turned on/off.
> 
> On the other hand, when thinkpad_acpi.ko is loaded, then both buttons
> mute and micmute correctly generates input events; mute via AT keyboard
> and micmute via ThinkPad Extra Buttons. But led is not changed. When
> thinkpad_acpi.ko is loaded it turn off both leds (mute and micmute) and
> leds after pressing any of those buttons, leds are not turned on again.

With thinkpad_acpi.ko loaded, kernel should handle the LEDs, right? Do
we have a support for that? Do they have directories in
/sys/class/leds? What are the triggers there?

With thinkpad_acpi.ko unloaded, hardware drives the LEDs, so nothing
for us to do...

       	     	      	     	   	    	     	 	   Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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