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

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Message-ID: <AANLkTimkElR1u-iRyFfCEQR5VTZvcyEIGQodfmFNtbC_@mail.gmail.com>
Date:	Tue, 29 Jun 2010 17:23:19 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Jiri Slaby <jslaby@...e.cz>
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 Tue, Jun 29, 2010 at 12:40 PM, Jiri Slaby <jslaby@...e.cz> wrote:
> 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).

What kind of slot is it, and what kind of device was being used,
something designed for this machine or just some random card? Can they
tell what IRQ the device is reportedly using in Windows and if it
matches what Linux reports?
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