Audible clicks with ICH4 AC'97
WATANABE Kazuhiro
CQG00620 at nifty.ne.jp
Mon Jan 4 14:02:15 UTC 2010
Hi.
Can you hear any differences when you run the following commands (as
root) ?
# sysctl dev.pcm.0.eapd=0
# sysctl dev.pcm.0.eapd=1
At Sun, 03 Jan 2010 19:30:29 +0100,
martinko wrote:
> Hi list,
>
> I've upgraded from 6.4 to 8.0 and hoped that my long-time issue will be
> gone but no, I'm still experiencing the same audio distortion --
> Playing music on FreeBSD reminds me of old tapes while listening to the
> same files on MS Windows produces no acoustic clicks etc at all.
> Well, I cannot hear these clicks during music but throughout low volume
> passages they are quite audible and they stop when playback stops.
>
> I still hope something can be done about it.
> Any suggestions / ideas please ?
>
> Cheers,
>
> Martin
>
> --
>
> $ uname -a
> FreeBSD mb-aw1n-bsd 8.0-RELEASE FreeBSD 8.0-RELEASE #0: Sat Nov 21
> 15:48:17 UTC 2009
> root at almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC i386
>
> $ pciconf -lv | grep -B 4 audio
> pcm0 at pci0:0:31:5: class=0x040100 card=0x18431043 chip=0x24c58086
> rev=0x03 hdr=0x00
> vendor = 'Intel Corporation'
> device = 'Realtek AC97 Audio (82801DBM SoundMAXController
> (ICH4-M B0 step))'
> class = multimedia
> subclass = audio
>
> $ cat /dev/sndstat
> FreeBSD Audio Driver (newpcm: 32bit 2009061500/i386)
> Installed devices:
> pcm0: <Intel ICH4 (82801DB)> at io 0xffaff800, 0xffaff400 irq 5 bufsz
> 16384 kld snd_ich [MPSAFE] (1p:4v/1r:1v channels duplex default)
>
> $ sysctl hw.snd dev.pcm
> hw.snd.feeder_rate_quality: 1
> hw.snd.feeder_rate_round: 25
> hw.snd.feeder_rate_max: 2016000
> hw.snd.feeder_rate_min: 1
> hw.snd.feeder_rate_polyphase_max: 183040
> hw.snd.feeder_rate_presets: 100:8:0.85 100:36:0.92 100:164:0.97
> hw.snd.feeder_eq_exact_rate: 0
> hw.snd.feeder_eq_presets:
> PEQ:16000,0.2500,62,0.2500:-9,9,1.0:44100,48000,88200,96000,176400,192000
> hw.snd.vpc_reset: 0
> hw.snd.vpc_0db: 45
> hw.snd.vpc_autoreset: 1
> hw.snd.latency_profile: 1
> hw.snd.latency: 5
> hw.snd.report_soft_matrix: 1
> hw.snd.report_soft_formats: 1
> hw.snd.compat_linux_mmap: 0
> hw.snd.vpc_mixer_bypass: 1
> hw.snd.verbose: 1
> hw.snd.maxautovchans: 16
> hw.snd.default_unit: 0
> hw.snd.version: 2009061500/i386
> hw.snd.default_auto: 0
> dev.pcm.0.%desc: Intel ICH4 (82801DB)
> dev.pcm.0.%driver: pcm
> dev.pcm.0.%location: slot=31 function=5 handle=\_SB_.PCI0.AUDI
> dev.pcm.0.%pnpinfo: vendor=0x8086 device=0x24c5 subvendor=0x1043
> subdevice=0x1843 class=0x040100
> dev.pcm.0.%parent: pci0
> dev.pcm.0.eapd: 1
> dev.pcm.0.play.vchans: 4
> dev.pcm.0.play.vchanmode: fixed
> dev.pcm.0.play.vchanrate: 48000
> dev.pcm.0.play.vchanformat: s16le:2.0
> dev.pcm.0.rec.vchans: 1
> dev.pcm.0.rec.vchanmode: fixed
> dev.pcm.0.rec.vchanrate: 48000
> dev.pcm.0.rec.vchanformat: s16le:2.0
> dev.pcm.0.buffersize: 16384
> dev.pcm.0.bitperfect: 0
> dev.pcm.0.ac97rate: 48000
> dev.pcm.0.wake: 0
>
> $ mixer
> Mixer vol is currently set to 75:75
> Mixer pcm is currently set to 25:25
> Mixer speaker is currently set to 40:40
> Mixer line is currently set to 75:75
> Mixer mic is currently set to 0:0
> Mixer cd is currently set to 75:75
> Mixer rec is currently set to 0:0
> Mixer igain is currently set to 0:0
> Mixer ogain is currently set to 50:50
> Mixer line1 is currently set to 75:75
> Mixer phin is currently set to 0:0
> Mixer phout is currently set to 0:0
> Mixer video is currently set to 75:75
> Recording source: mic
---
WATANABE Kazuhiro (CQG00620 at nifty.ne.jp)
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