linux-kernel - Re: [Bug #13471] Loading parport_pc kills the keyboard if ACPI is enabled

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Date:	Fri, 31 Jul 2009 16:17:35 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ozan Çağlayan <ozan@...dus.org.tr>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [Bug #13471] Loading parport_pc kills the keyboard if ACPI is
 enabled

O> Finally, it seems that the problem is available with 2.6.28, so the starting
> point is still fuzzy to me. I remember that the keyboard was working OK with
> 2.6.29_rc7 but now it's not.
> 
> Maybe we should drop this report from the regression list."
> 
> 
> Monday I'll have access to the computer. I'll build and try to find the last working version.
> Meanwhile, I'd like to hear about your possible finding.

There have been few changes to parport_pc but one thing recent changed
the probe for SuperIO chips via low addresses and that could be
interfering.

commit e2434dc1c19412639dd047a4d4eff8ed0e5d0d50
Author: Jens Rottmann <JRottmann@...PERTEmbedded.de>
Date:   Mon Jun 22 16:51:49 2009 +0100

changed the behaviour slightly (hence asking about which release if it
was a recent breakage). Its also a code area with very few changes so if
you can find which one worked last, you should be able to transplant that
parport_pc into 2.6.current and see if its parport or acpi triggered
breakage.

Alan
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