linux-kernel - Re: Sound plays at half speed; intel8x0 clock issue

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Date:	Mon, 18 Jun 2007 16:56:22 +0200
From:	Johannes Weiner <hannes-kernel@...urebad.de>
To:	dj@...id-web.co.uk
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Sound plays at half speed; intel8x0 clock issue

Hi,

On Mon, Jun 18, 2007 at 01:37:43PM +0100, David Johnson wrote:
> I'm running vanilla 2.6.21.5 on a Winfast NF4UK8AA motherboard and sound is 
> playing at half-speed.
> 
> I get the following output in dmesg:
> intel8x0_measure_ac97_clock: measured 51345 usecs
> intel8x0: measured clock 29136 rejected
> intel8x0: clocking to 48000
> 
> lspci says:
> 00:04.0 Multimedia audio controller: nVidia Corporation CK804 AC'97 Audio 
> Controller (rev a2)
> 
> I've tried passing various ac97_clock values but it seems to have no effect. 
> I've also tried setting ac97_quirk but that doesn't help either.
> 
> I attach my full dmesg and .config. Please let me know if I can provide more 
> information or help debug this.

dmesg:

[SNIP]
>   DMA32 zone: 3527 pages used for memmap
>   DMA32 zone: 254505 pages, LIFO batch:31
>   Normal zone: 0 pages used for memmap
> Nvidia board detected. Ignoring ACPI timer override.
> If you got timer trouble try acpi_use_timer_override
[SNAP]

Perhaps you might want to try the acpi_use_timer_override bootflag?

	Hannes
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