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

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Date:	Mon, 4 Jun 2007 13:46:45 -0400
From:	"Dmitry Torokhov" <dmitry.torokhov@...il.com>
To:	"Henrique de Moraes Holschuh" <hmh@....eng.br>
Cc:	"Pavel Machek" <pavel@....cz>, "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 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?

-- 
Dmitry
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