linux-kernel - Re: 2.6.22-rc[23]: blinking capslock led, stuck keys?

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Date:	Mon, 4 Jun 2007 22:57:01 +0200
From:	Pavel Machek <pavel@....cz>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	Henrique de Moraes Holschuh <hmh@....eng.br>,
	Andi Kleen <ak@...e.de>, Jiri Kosina <jikos@...os.cz>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.22-rc[23]: blinking capslock led, stuck keys?

On Mon 2007-06-04 13:46:45, Dmitry Torokhov wrote:
> On 6/4/07, Henrique de Moraes Holschuh <hmh@....eng.br> wrote:
> >On Mon, 04 Jun 2007, Dmitry Torokhov wrote:
> >> >...but I'm not quite sure it is a buggy keyboard. It happens _way_ too
> >> >often. Launch the line above and try to do some typing...
> >>
> >> This used to work fine on my box last time I tried it (the switch
> >> itself is offloaded to a keventd and shoud not get in the way) but
> >> then they push all kind of ACPI/SMM crap together with KBC so who
> >> knows... I should try it again when I get home.
> >
> >Err... in laptops, almost *always* the KDC is emulated by the embedded
> >controller, so I bet you're right on the money, there.  It is not "a buggy
> >KDC", it is a buggy EC firmware and/or buggy SMBIOS which is a lot more
> >common.
> >
> >And DoS'ing the EC is very high on the Don't Do That list on a laptop.  If
> >the X60 is only losing keypresses and producing no bigger fireworks, that's
> >outstanding behavior (as far as I trust ThinkPad firmware, anyway).
> >
> >So please throttle anything that might access the KDC way too much (as
> >compared to normal keyboard operation by an user).
> 
> What would be reasonable throttling? Once every 100 ms?

Well... this thread began with me having problems with leds blinking
once per ten seconds. I do not think throttling is going to help.

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