linux-kernel - Re: linux-next: Tree for June 13: IO APIC breakage on HP nx6325

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Message-ID: <20080629192353.GA9132@srcf.ucam.org>
Date:	Sun, 29 Jun 2008 20:23:53 +0100
From:	Matthew Garrett <mjg59@...f.ucam.org>
To:	"Maciej W. Rozycki" <macro@...ux-mips.org>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, Ingo Molnar <mingo@...e.hu>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-next@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Len Brown <lenb@...nel.org>
Subject: Re: linux-next: Tree for June 13: IO APIC breakage on HP nx6325

On Sun, Jun 29, 2008 at 08:05:42PM +0100, Maciej W. Rozycki wrote:

>  It is the reverse -- checking the DSDT ID is coarser, matching all the
> systems that use the broken firmware.  With DMI we may face both false
> positives and false negatives which imply further maintenance actions.  
> Please note as proved over the years understanding of these issues seems
> to be problematic for people, so the result may be another round of
> discussions reinventing the wheel in a couple of years' time or so.

The DSDT can't be updated without the BIOS being updated, and the DMI 
information gives us a BIOS version string that can be matched against 
if a fixed version is ever released. I'd be in favour of doing it with 
DMI on the grounds that it's how we already handle machine-specific 
quirks rather than adding new code to do it.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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