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

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Date:	Mon, 11 Jan 2016 22:12:28 +0100
From:	Johannes Stezenbach <js@...21.net>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Darren Hart <dvhart@...radead.org>,
	Pavel Machek <pavel@....cz>,
	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 11, 2016 at 09:03:01PM +0100, Pali Rohár wrote:
> On Monday 11 January 2016 20:28:00 Henrique de Moraes Holschuh wrote
> > The two features are not the same (and are handled differently by the
> > firmware, for whatever reason), although they do serve the same
> > purpose. I don't think a thinkpad will ever have both features at
> > the same time, so I have no idea why they changed the firmware
> > interface.
...
> And more important, I was told that ThinkPad x230 comes in variant with 
> both ThinkLight (that LED upper the display) and keyboard backlight 
> (under they keyboard).

I can confirm this, my x230 has both.  FWIW, BIOS hotkey
Fn+Space cycles through off, dim backlight, full backlight
and full thinklight. /sys/class/leds/tpacpi::thinklight/brightness
can be read (showing either 0 or 255) but writes are ignored.
Dito for /proc/acpi/ibm/light.

Johannes