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

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Message-ID: <20100312173341.GA4931@khazad-dum.debian.net>
Date:	Fri, 12 Mar 2010 14:33:42 -0300
From:	Henrique de Moraes Holschuh <hmh@....eng.br>
To:	H Hartley Sweeten <hartleys@...ionengravers.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	"rpurdie@...ys.net" <rpurdie@...ys.net>
Subject: Re: [PATCH] backlight: provide sysfs percent brightness attribute

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.

-- 
  "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
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