Audible clicks with ICH4 AC'97

[WATANABE Kazuhiro]

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)