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

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Message-ID: <0D753D10438DA54287A00B02708426976368437D29@AUSP01VMBX24.collaborationhost.net>
Date:	Fri, 12 Mar 2010 11:49:23 -0600
From:	H Hartley Sweeten <hartleys@...ionengravers.com>
To:	Richard Purdie <rpurdie@...ys.net>,
	Henrique de Moraes Holschuh <hmh@....eng.br>
CC:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] backlight: provide sysfs percent brightness attribute

On Friday, March 12, 2010 10:40 AM, Richard Purdie wrote:
> 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.

OK.  Thank for your input.

Regards,
Hartley