From: Pavel Machek <pavel@ucw.cz>
To: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Zhang Rui <rui.zhang@intel.com>,
Richard Purdie <rpurdie@rpsys.net>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
"lenb@kernel.org" <lenb@kernel.org>,
"corentincj@iksaif.net" <corentincj@iksaif.net>
Subject: Re: [PATCH 1/3] backlight: Allow drivers to update the core, and generate events on changes
Date: Wed, 29 Jul 2009 17:05:24 +0200 [thread overview]
Message-ID: <20090729150524.GD1534@ucw.cz> (raw)
In-Reply-To: <20090716024057.GA2461@srcf.ucam.org>
> > > You want smoothing even in a default policy, and doing that well might
> > > be a bit much for the kernel?
> > >
> > sorry, I don't understand.
> > do you mean that there should be a default policy in the kernel?
>
> No, I mean that the only default policy you could reasonably have in the
> kernel would be tying the backlight directly to the ALS. And that sucks.
> You need some degree of smoothing, and that's a job better left to
> userspace.
How would that be done? Wake up userspace 100times a second so it can
read an integer and ardd it to running average?
Is ALS device stupid sensor, or can it do some smoothing/watermarks
itself?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2009-07-29 15:05 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-07-13 20:41 [PATCH 1/3] backlight: Allow drivers to update the core, and generate events on changes Matthew Garrett
2009-07-13 20:41 ` [PATCH 2/3] ACPI: Update the backlight state when we change brightness Matthew Garrett
2009-07-13 20:41 ` [PATCH 3/3] eeepc-laptop: " Matthew Garrett
2009-07-14 0:58 ` [PATCH 1/3] backlight: Allow drivers to update the core, and generate events on changes ykzhao
2009-07-14 1:53 ` Matthew Garrett
2009-07-14 15:48 ` Matthew Garrett
2009-07-14 10:30 ` Henrique de Moraes Holschuh
2009-07-14 13:21 ` Matthew Garrett
2009-07-14 15:54 ` Henrique de Moraes Holschuh
2009-07-14 12:29 ` Richard Purdie
2009-07-14 12:55 ` Matthew Garrett
2009-07-15 7:55 ` Zhang Rui
2009-07-15 8:22 ` Richard Purdie
2009-07-15 8:38 ` Zhang Rui
2009-07-15 9:11 ` Richard Purdie
2009-07-15 13:58 ` Matthew Garrett
2009-07-16 2:39 ` Zhang Rui
2009-07-16 2:40 ` Matthew Garrett
2009-07-29 15:05 ` Pavel Machek [this message]
2009-07-29 15:20 ` Matthew Garrett
2009-07-29 15:31 ` Richard Purdie
-- strict thread matches above, loose matches on Subject: below --
2009-07-14 16:06 Matthew Garrett
2009-07-16 21:33 ` Michal Schmidt
2009-07-16 21:33 ` Michal Schmidt
2009-07-18 11:48 ` Pavel Machek
2009-09-19 23:24 ` Henrique de Moraes Holschuh
2009-09-20 4:15 ` Matthew Garrett
2009-09-20 11:16 ` Henrique de Moraes Holschuh
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