linux-kernel - Re: Power Management framework proposal

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Date:	Fri, 27 Jul 2007 11:46:38 +0000
From:	Pavel Machek <pavel@....cz>
To:	david@...g.hm
Cc:	Arjan van de Ven <arjan@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-pm <linux-pm@...ts.linux-foundation.org>
Subject: Re: Power Management framework proposal

Hi!

> >>example 1: a laptop screen
> >>
> >>mode  capacity power description
> >>0        0        0    off
> >>1      100      100    full brightness
> >>2       70       60    half power to the backlight
> >>3       50       35    quarter power to the backlight
> >>4       30       25    eighth power to the backlight
> >>5        5       10    backlight off.
> >>
> >>example 2: a front-panel display on a server (no 
> >>variable backlight
> >>control)
> >>
> >>mode capacity power description
> >>0       0        0   off
> >>1     100      100   backlight on
> >>2      50       10   backlight off
> >
> >
> >the problem is: the person who SETS these needs to know 
> >what they mean.
> 
> that's what the description is for. this info can be 
> provided by the driver as part of the list_modes() 
> function.

That's what /sys/class/backlight/ is for :-).

> >as someone who wrote (part of) a power policy manager; 
> >sorry but you
> >take away information I need, and in addition the 
> >different API's are
> >absolutely no big deal.
> 
> assuming that nobody else chimes in to disagree with you 
> I'll accept your judgement and drop the issue.

Just for the record, I agree with Arjan here.
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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