linux-kernel - Re: blink driver power saving

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Message-ID: <20070704193711.GG2728@elf.ucw.cz>
Date:	Wed, 4 Jul 2007 21:37:12 +0200
From:	Pavel Machek <pavel@....cz>
To:	Andi Kleen <ak@...e.de>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Indan Zupancic <indan@....nu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Stephen Hemminger <shemminger@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: blink driver power saving

Hi!

> > > > > Perhaps one of you geniuses who all hate it can find a better way to
> > > > > solve the "video output dead after kexec; but need visual feedback to the user
> > > > > while crash dumping" problem. I'm waiting for your patches.
> > > > >
> > > > 
> > > > I don't don't like it ;) Unfortunately too many people end up enabling
> > > 
> > > Yes that's pretty weird. I admit I hadn't expected
> > > that problem. blink is equivalent to "annoy me" and it
> > > is a mystery why so many people should willingly ask their computer to 
> > > annoy them.
> > 
> > tristate "Keyboard blink driver"
> > 
> > ...drivers are not expected to act on their own. I was expecting to
> > get nice /sys/class/led* interface to my keyboard leds.
> 
> What's the benefit of such an interface? If you're able to trigger
> keyboard LEDs via that interface, you're also able to use the ioctl()
> on /dev/console.

Well, at least it is standartized interface... plus it can do stuff
like "blink that led on disk access".

> I think the intention of the blink driver was to have a *early* blink,
> i.e. before initrd (and on systems without intrd, before the first
> init script runs).

...and yes, it can autoblink, too. It should be even possible to set
default behaviour of led to blink, doing what the blink driver does,
but in a clean way.
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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