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Date:   Wed, 25 Oct 2017 15:17:56 +0200
From:   Harvey <harv@....de>
To:     Michał Kępień <kernel@...pniu.pl>
Cc:     Jonathan Woithe <jwoithe@...t42.net>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: Kernel error messages: leds fujitsu::radio_led: Setting an LED's
 brightness failed

Am 25.10.2017 um 06:39 schrieb Michał Kępień:
>>>   - Investigating the E LED.  This requires taking a look at the DSDT
>>>     dump from your laptop and searching for clues as to how this LED is
>>>     handled.  I will be happy to do that, but again, no promises about
>>>     how much time it will take.  (And given the nature of this task, I
>>>     cannot promise I will find anything reasonable at all.  I also might
>>>     ask you to do some further experiments as I do not have an E751
>>>     myself.)
> 
> I feel stupid for only suggesting this now, but can this simply be the
> eco LED?  The DSDT dump from your laptop suggests so, as well as the
> description of the E LED in the manual.  Have you tried playing around
> with /sys/class/leds/fujitsu::eco_led?

No, I haven't.

I tried to set brightness to 255 and back to 0:

[root@...enix ~]# echo 255 >/sys/class/leds/fujitsu::eco_led/brightness

=> eco LED lights up!

[root@...enix ~]# cat /sys/class/leds/fujitsu::eco_led/brightness

=> eco LED off!

Tadaaa!

So yes, this is the eco LED of my E751.

>> Don't forget to take a look at the I LED...
> 
> I could not find anything in the DSDT dump from your laptop that would
> suggest this LED can be controlled using ACPI.
> 

Greetings
Harvey

-- 
I am root. If you see me laughing, you'd better have a backup!



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