linux-kernel - Re: blink driver power saving

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Message-Id: <200707021351.57965.ak@suse.de>
Date:	Mon, 2 Jul 2007 13:51:57 +0200
From:	Andi Kleen <ak@...e.de>
To:	"Indan Zupancic" <indan@....nu>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Stephen Hemminger" <shemminger@...ux-foundation.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	"" Dmitry Torokhov "" <dtor@...ightbb.com>
Subject: Re: blink driver power saving

On Monday 02 July 2007 13:43:23 Indan Zupancic wrote:
> On Mon, July 2, 2007 01:59, Andi Kleen wrote:
> > Well only those that could be already hung from user space
> > with setleds (that was also confirmed).  Actually I thought
> > they didn't hang completely, but just stopped reacting to
> > the keyboard (which is actually pretty bad for every user
> > to be able to trigger)
> 
> Pavel's lost key events, mine stopped reacting altogether.

Did you try if the network was still alive? Perhaps it was
just a locked up keyboard.

> 
> > I guess the better way to handle those would be to find out the
> > minimum frequency of blinking that is still ok and rate limit it to that in
> > the keyboard driver.
> 
> Dmitry already has a patch for that. He limited it to one event each 50 ms.

Great.

> 
> > Anyways, Stephen's patch just doesn't make sense:
> > he clearly didn't understand the code at all. Before you
> > apply it and cripple it better drop the driver completely.
> 
> CC'ing Dmitry, as I think he doesn't like the blink driver much either. ;-)

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.

-Andi
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