linux-kernel - Re: [PATCH] backlight: provide sysfs percent brightness attribute

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Message-ID: <1268415585.1625.13.camel@rex>
Date:	Fri, 12 Mar 2010 09:39:45 -0800
From:	Richard Purdie <rpurdie@...ys.net>
To:	Henrique de Moraes Holschuh <hmh@....eng.br>
Cc:	H Hartley Sweeten <hartleys@...ionengravers.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] backlight: provide sysfs percent brightness attribute

On Fri, 2010-03-12 at 14:33 -0300, Henrique de Moraes Holschuh wrote:
> On Fri, 12 Mar 2010, H Hartley Sweeten wrote:
> > It's usually more convenient to set the backlight brightness
> > as a 'percent' of total brightness rather than using the raw
> > 'brightness' value.
> 
> Well, that scale is often not linear, so you are not dealing with fractions
> of the effective brightness, just with fractions of an arbritary scale
> exported by the backend driver.  Much of the "usefulness" of a "percent"
> scale dies right there.

This patch does nothing to address that though.

I agree this is a userland issue and having two interfaces to the kernel
to do the same thing is not a good idea in general.

So no, I'm not going to take that patch, sorry.

Cheers,

Richard

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