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

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Date:	Tue, 12 Jan 2016 22:58:04 +0100
From:	Pavel Machek <pavel@....cz>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	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

Hi!

On Mon 2016-01-11 21:03:01, 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.
> 
> Maybe we should decide if ::kbd_backlight LED suffix could be used also 
> for other LED devices and not only for those which are physically under 
> the keyboard.

Another problem is that N900 has _6_ backlight LEDs. Named
lp5523::kb1..6. ... Which does means desktop software will probably
not pick them up :-(. 

I guess we could have "/sys/class/kbd_light/brightness" that would
control all of them with one write.

Next question is.. apparently there are some keyboards that have
per-key RGB backlight... but maybe we can just call that "weird
enough" and ignore...

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html