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Date:      Wed, 26 Mar 2003 13:02:23 -0800
From:      "Kevin Oberman" <oberman@es.net>
To:        current@freebsd.org
Subject:   AC97 sound problems with current
Message-ID:  <20030326210223.9B74B5D07@ptavv.es.net>

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After upgrading my laptop from STABLE to CURRENT on 3/14 I have been
having problems with GnomeMeeting. Often the sound is badly broken with
'spurts' of sound with silent gaps in between. This was never the case
with STABLE. Other times it's fine.

When I looked at my dmesg output I noticed some changes between STABLE
and CURRENT for the pcm0 device. Under STABLE I only got two messages:
 pcm0: <Intel 82801CA (ICH3)> port 0x18c0-0x18ff,0x1c00-0x1cff irq 11 at device 31.5 on pci0
 pcm0: <Analog Devices AD1881A ac97 codec>
Under CURRENT I get a third:

 pcm0: measured ac97 link rate at 512000000 Hz
But the link rate jumps all over the place:
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 204800000 Hz
 pcm0: measured ac97 link rate at 5595 Hz
 pcm0: measured ac97 link rate at 512000000 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 1024000000 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 204800000 Hz
 pcm0: measured ac97 link rate at 204800000 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 204800000 Hz
 pcm0: measured ac97 link rate at 204800000 Hz
 pcm0: measured ac97 link rate at 5976 Hz
 pcm0: measured ac97 link rate at 95997 Hz
 pcm0: measured ac97 link rate at 96051 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 204800000 Hz
 pcm0: measured ac97 link rate at 1534082 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 1541008 Hz
 pcm0: measured ac97 link rate at 1527218 Hz
 pcm0: measured ac97 link rate at 1536384 Hz
 pcm0: measured ac97 link rate at 1526080 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 95997 Hz
 pcm0: measured ac97 link rate at 96028 Hz
 pcm0: measured ac97 link rate at 95961 Hz
 pcm0: measured ac97 link rate at 96033 Hz
 pcm0: measured ac97 link rate at 95961 Hz
 pcm0: measured ac97 link rate at 90331 Hz
 pcm0: measured ac97 link rate at 227555555 Hz
 pcm0: measured ac97 link rate at 204800000 Hz
 pcm0: measured ac97 link rate at 204800000 Hz
 pcm0: measured ac97 link rate at 256000000 Hz

While I don't know anything about DSPs in general or the AC97, this
looks most odd. The ones around 96 KHz look reasonable, I guess, but I
have a hard time believing >200 MHz or <6 KHz.

Has anyone else with an ICH3 chip set seen this? Any idea what might be
going on here?

R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman@es.net			Phone: +1 510 486-8634




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