From: Richard Purdie <rpurdie@rpsys.net>
To: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: H Hartley Sweeten <hartleys@visionengravers.com>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] backlight: provide sysfs percent brightness attribute
Date: Fri, 12 Mar 2010 09:39:45 -0800 [thread overview]
Message-ID: <1268415585.1625.13.camel@rex> (raw)
In-Reply-To: <20100312173341.GA4931@khazad-dum.debian.net>
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
next prev parent reply other threads:[~2010-03-12 17:40 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-12 17:10 [PATCH] backlight: provide sysfs percent brightness attribute H Hartley Sweeten
2010-03-12 17:27 ` Matthew Garrett
2010-03-12 17:33 ` Henrique de Moraes Holschuh
2010-03-12 17:39 ` Richard Purdie [this message]
2010-03-12 17:49 ` H Hartley Sweeten
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