From owner-freebsd-stable  Wed Mar 13 11:43:30 2002
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Date: Wed, 13 Mar 2002 20:43:22 +0100 (CET)
From: Dan Larsson <dl@tyfon.net>
To: FreeBSD Stable List <stable@freebsd.org>
Subject: Poor sound quality with onboard AC97 audio
Message-ID: <20020313030844.D26883-100000@hq1.tyfon.net>
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This is on FreeBSD-4.5 STABLE i386 with world rebuilt March 7 and ports
yesterday.

dmesg output:
pcm0: <Intel 82801BA (ICH2)> port 0xa400-0xa43f,0xa800-0xa8ff irq 10 at device 31.5 on pci0
pcm0: ac97 codec id 0x414c4710 (Avance Logic ALC200/200P)
pcm0: ac97 codec features headphone, 18 bit DAC, 18 bit ADC, 5 bit master volume, Realtek 3D Stereo Enhancement
pcm0: ac97 primary codec extended features variable rate PCM, reserved 1, AMAP, reserved 4
pcm: setmap 13000, 4000; 0xd477b000 -> 13000
pcm: setmap 17000, 4000; 0xd477f000 -> 17000
pcm: setmap 1b000, 4000; 0xd4783000 -> 1b000
pcm0: measured ac97 link rate at 48004 Hz, will use 48000 Hz

sndstat output:
FreeBSD Audio Driver (newpcm) Mar  7 2002 19:05:14
Installed devices:
pcm0: <Intel 82801BA (ICH2)> at io 0xa800, 0xa400 irq 10 bufsz 16384
(1p/2r/0v channels duplex)
        [pcm0:2:record]: speed 0, format 00000000, flags 00000000
        feeder_root(00000000)
        [pcm0:1:record]: speed 0, format 00000000, flags 00000000
        feeder_root(00000000)
        [pcm0:0:play]: speed 44100, format 10000010, flags 00007030, pid 287
        feeder_root(10000010)

The resulting output sounds somewhat like a record player unable to keep a
stable pitch.

Any ideas? (I'm leaning towards it's got something to do with the driver
since the commercial OpenSound driver OSS/FreeBSD 3.9.6b works just fine).

(FWIW this is the builtin soundchip on the "ASUS P4B" motherboard)


Regards
+------
Dan Larsson  -+- Tyfon Svenska AB -+-  DL1999-RIPE
2AA5 90AE 5185 5924 1E0B  1A99 EC8A EA84 406B 06B9








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