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Date:      Fri, 3 May 2002 11:00:20 -0700
From:      Alfred Perlstein <bright@mu.org>
To:        Orion Hodson <hodson@icir.org>
Cc:        freebsd-multimedia@freebsd.org, current@freebsd.org
Subject:   Re: fast playback with Intel 82801BA (ICH2)
Message-ID:  <20020503180020.GP36741@elvis.mu.org>
In-Reply-To: <200205020108.g42188v67590@puma.icir.org>
References:  <20020502004915.GN98487@elvis.mu.org> <200205020108.g42188v67590@puma.icir.org>

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* Orion Hodson <hodson@icir.org> [020501 18:10] wrote:
> /-- Alfred Perlstein wrote:
> | -current compiled today mp3s play too fast, any ideas on how to
> | diagnose this?
> | 
> | pcm0: <Intel 82801BA (ICH2)> port 0xef00-0xef3f,0xe800-0xe8ff irq 9 at device
> |  31.5 on pci0
> | pcm0: measured ac97 link rate at 44061 Hz
> 
> You can set a sysctl to set the ac97 link rate.  I don't recall offhand what 
> it is (hw.snd.pcm0.ac97rate?) - "sysctl -a | grep ac97" will find it.
> 
> There is a calibration test in the ich code since various mfrs do funny things 
> with the clock.  I'd be interested to know what boot -v output is and what 
> ac97 link rate works.  This is the second box reported failing on this 
> recently.

This makes it sound almost perfect:

sysctl hw.snd.pcm0.ac97rate=55000

the default 44061 is bad.

-- 
-Alfred Perlstein [alfred@freebsd.org]
'Instead of asking why a piece of software is using "1970s technology,"
 start asking why software is ignoring 30 years of accumulated wisdom.'
Tax deductible donations for FreeBSD: http://www.freebsdfoundation.org/

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