linux-kernel - Re: [PATCH V3] VIA IRQ quirk behaviour change

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Date:	Sun, 10 Sep 2006 17:30:18 -0400
From:	Lee Revell <rlrevell@...-job.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
Cc:	Greg KH <greg@...ah.com>, Alan Cox <alan@...rguk.ukuu.org.uk>,
	Daniel Drake <dsd@...too.org>, akpm@...l.org,
	torvalds@...l.org, sergio@...giomb.no-ip.org, jeff@...zik.org,
	cw@...f.org, bjorn.helgaas@...com, linux-kernel@...r.kernel.org,
	harmon@....edu, len.brown@...el.com, vsu@...linux.ru,
	liste@...det.net
Subject: Re: [PATCH V3] VIA IRQ quirk behaviour change

On Sun, 2006-09-10 at 21:45 +0100, Matthew Garrett wrote:
> On Sun, Sep 10, 2006 at 02:40:46PM -0400, Lee Revell wrote:
> 
> > Some applications such as realtime audio and probably gaming require
> > ACPI to be disabled, as it causes horrible latency problems.  This
> > applies equally to Linux and Windows.
> 
> How, and on what hardware?

Sorry, all I have is anecdotal evidence.  The scope of the problem isn't
fully known.  Could be related to vendors implementing ACPI using SMM.
Vendors are tight lipped about which hardware is affected because it
understandably annoys users.

It's been a FAQ in Windows pro audio forums for years; digital audio
software vendors recommend disabling ACPI (on Windows this means
reinstalling with the legacy PC HAL) as a last resort if you can't get a
low enough latency on some hardware.

Lee

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