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Date:   Wed, 25 Oct 2017 06:39:57 +0200
From:   Michał Kępień <kernel@...pniu.pl>
To:     Harvey <harv@....de>
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

> >   - 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?

> 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.

-- 
Best regards,
Michał Kępień

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