linux-kernel - Re: blink driver power saving

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Date:	Thu, 05 Jul 2007 16:30:46 -0400
From:	Bill Davidsen <davidsen@....com>
To:	Pavel Machek <pavel@....cz>
CC:	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

Pavel Machek wrote:

>>> ...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".
> 
One of many useful things for system without blinking lights, disk 
network, thermal alert, etc. And a cheap helper for handicapped folks 
who can't hear an audible alert.

>> 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.

Endlessly useful, alarm clock, non-fatal errors on boot, etc.

<it would be nice>
If this were done, priority levels would be nice, so the "I'm taking a 
dump" or "panic" would block lower level system use like disk or network 
lights, and user applications would have some policy to put them higher 
or lower than the pseudo disk light (or not).
</not nice>

-- 
Bill Davidsen <davidsen@....com>
   "We have more to fear from the bungling of the incompetent than from
the machinations of the wicked."  - from Slashdot
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