linux-kernel - Re: Kernel error messages: leds fujitsu::radio

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Date:   Sun, 23 Jul 2017 15:44:20 +0930
From:   Jonathan Woithe <jwoithe@...t42.net>
To:     Micha?? K??pie?? <kernel@...pniu.pl>
Cc:     Harvey <harv@....de>, 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

Hi Michal

On Thu, Jul 20, 2017 at 08:42:57AM +0200, Micha?? K??pie?? wrote:
> > I found your mail address in https://patchwork.kernel.org/patch/8598801/
> > and it seems you are somehow involved in the improvement for
> > fujitsu-laptop LED handling. If this does not 'belong' to you, maybe you
> > can point me in the right direction where to report the issue.
> 
> No worries, that is fine, though I have CCed Jonathan Woithe, who is the
> maintainer of fujitsu-laptop, and both the platform-driver-x86 mailing
> list and LKML (both are open lists).

This is mainly to acknowledge that I have read this email.  Since my Fujitsu
does not have any LEDs I do not have any direct experience with their use
within the driver.  The existing LED code was contributed by others and
recently modified by Michal's patches as part of a broader tidy up of the
driver.  I'm more than happy for Michal to take the lead in investigating
this since I think he has a Fujitsu with LEDs.

> > I am using archlinux and as of kernel
> > 4.11 (IIRC) there has appeared an error message in the journalctl log
> > saying:
> > 
> > kernel: leds fujitsu::radio_led: Setting an LED's brightness failed
> > (-2147483648)
> > 
> > This appears for several times:
> > 
> > harvey@...enix ~/Documents/scripts $ sudo journalctl -b | grep radio_led
> > 725:Jul 14 12:29:37 gruenix kernel: leds fujitsu::radio_led: Setting an
> > LED's brightness failed (-2147483648)
> :
> 4.11 included a patch which sets the default trigger for the radio LED
> to rfkill-any, which would explain why you only started seeing these
> errors after upgrading to that version.  See also below.
> 
> > Some of the LEDs are not working under linux, especially the bluetooth
> > one
> 
> Where is the Bluetooth LED located?  I cannot see it.  Can you show it
> on a photo?  How does it behave under other operating systems?

Also, how did these LEDs behave under earlier Linux kernel versions?  In
other words, is the non-functionality of these LEDs a regression in 4.11, or
have they never worked on your laptop?

Regards
  jonathan