linux-kernel - Re: Laptop keyboard unusable when ACPI is active was Re: [2.6.22] i8042, ACPI, ipw2100 and issues reported by psmouse.c atkbd.c

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Date:	Sat, 20 Oct 2007 20:33:09 +0200
From:	Pavel Machek <pavel@....cz>
To:	"legolas558@...rs.sourceforge.net" <legolas558@...rs.sourceforge.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Laptop keyboard unusable when ACPI is active was Re: [2.6.22]
	i8042, ACPI, ipw2100 and issues reported by psmouse.c atkbd.c

Hi!

> > Try disabling acpi embedded controller.
> >   
> How can I accomplish this? Are you referring to the i8042?

rmmod acpi_ec or how is it called. But I'm not sure how easy this is.

> > Try watching keyboard interrupts. Are they lost?
> >   
> I am pretty sure they are. I think that ACPI pauses interrupts for a
> while (100ms?) and so some keyboard interrupts are lost.

input layer can poll keyboard on its own, perhaps that helps?

Can you try to measure the interrupt latencies?

Does this happen in init=/bin/bash?
							Pavel

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