linux-kernel - Re: [PATCH 1/1] ACPI: pci_irq, add PRT

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Date:	Tue, 29 Jun 2010 20:40:39 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Robert Hancock <hancockrwd@...il.com>
CC:	Matthew Garrett <mjg59@...f.ucam.org>, lenb@...nel.org,
	linux-pci@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH 1/1] ACPI: pci_irq, add PRT_ quirk for IBM Bartolo

On 06/28/2010 11:37 PM, Robert Hancock wrote:
> On Mon, Jun 28, 2010 at 2:48 PM, Matthew Garrett <mjg59@...f.ucam.org> wrote:
>> I can guarantee to you that a generic Windows install does not have a
>> quirk for an IBM PoS system released years after that CD was pressed.

The system in question is very old, any current Windows release is newer
than that.

>> The relevance is that if Windows works without a quirk, then somewhere
>> our behaviour diverges from that of Windows and it's likely that other
>> machines are also hit by the same issue. Users of those systems may not
>> have a support contract with a commercial Linux vendor and may just
>> decide to use Windows instead, so there's an incentive for us to
>> determine if that's the case and fix Linux's behaviour to match Windows
>> rather than to just quirk over it.
> 
> Exactly, this seems like a pretty obvious failure, so either IBM's
> testing on this machine under Windows was hopelessly inadequate and it
> is broken there too, or else Windows is doing something different and
> maybe we should be doing the same thing..

The answer I got is "it works there with a driver" whatever it means
(I'm no expert on windows drivers and have no idea what they can do and
what quirks can be implemented that way).

regards,
-- 
js
suse labs
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