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Date: Wed, 29 Jul 2009 17:05:24 +0200 From: Pavel Machek <pavel@....cz> To: Matthew Garrett <mjg59@...f.ucam.org> Cc: Zhang Rui <rui.zhang@...el.com>, Richard Purdie <rpurdie@...ys.net>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>, "lenb@...nel.org" <lenb@...nel.org>, "corentincj@...aif.net" <corentincj@...aif.net> Subject: Re: [PATCH 1/3] backlight: Allow drivers to update the core, and generate events on changes > > > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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