kern/180966: snd_envy24: recording broken

[Eugene Zheganin]

>Number:         180966
>Category:       kern
>Synopsis:       snd_envy24: recording broken
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Jul 31 11:40:00 UTC 2013
>Closed-Date:
>Last-Modified:
>Originator:     Eugene Zheganin
>Release:        10.0-CURRENT
>Organization:
Vivat-Trade LLC
>Environment:
FreeBSD icecast.bolid.fm 10.0-CURRENT FreeBSD 10.0-CURRENT #0 r253444: Thu Jul 18 17:25:07 YEKT 2013     emz@:/usr/obj/usr/src/sys/GENERIC  amd64
>Description:
I have an M-Audio Audiophile 24/96 board.
While everything is fine while playing the sound, recording sound from the line-in gives distorted sound (like in VoIP when some frames are dropping, only in this case no clean sound can be heard at all).

Attempted measures to resolve:

- changing HZ from 1000 to 100
- changing HZ from 100 to 4000
- disabling virtual channels
- changing dev.pcm.1.play.vchanrate/dev.pcm.1.play.vchanrate from 48000 to 41000 and back
- enabling dev.pcm.0.bitperfect

This didn't help, after some struggling I enabled the onboard hda card and got clean sound ot it's line-in.
>How-To-Repeat:
Try to record sound from snd_envy24(4) card.
>Fix:
Use snd_hda(4) for the purpose of sound recording.

>Release-Note:
>Audit-Trail:
>Unformatted: