linux-kernel - Re: [PATCH] thinkpad_acpi: Add support for keyboard backlight

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Message-Id: <1452361154.673684.487414482.6CCEAE4B@webmail.messagingengine.com>
Date:	Sat, 09 Jan 2016 15:39:14 -0200
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	Pavel Machek <pavel@....cz>,
	Pali Rohár <pali.rohar@...il.com>
Cc:	Darren Hart <dvhart@...radead.org>,
	ibm-acpi-devel@...ts.sourceforge.net,
	platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Fabio D'Urso" <fabiodurso@...mail.it>
Subject: Re: [PATCH] thinkpad_acpi: Add support for keyboard backlight

On Mon, Jan 4, 2016, at 18:12, Pavel Machek wrote:
> > This patch adds support for controlling keyboard backlight via standard
> > linux led class interface (::kbd_backlight). It uses ACPI HKEY device with
> > MLCG and MLCS methods.
> > 
> > Signed-off-by: Pali Rohár <pali.rohar@...il.com>
> > Tested-by: Fabio D'Urso <fabiodurso@...mail.it>
> 
> On my thinkpad, keyboard light is controlled by
> 
> /sys/class/leds/tpacpi\:\:thinklight/brightness
> 
> (that's a bad name).

That's because the driver was not updated to support your laptop, AND I
don't recall if someone mapped the full behavior of the ACPI thinklight
interface in your thinkpad :-(

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh