amd64/189726: microphone not working on 9.2 and 10.0

[Viktor]

>Number:         189726
>Category:       amd64
>Synopsis:       microphone not working on 9.2 and 10.0
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-amd64
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon May 12 17:30:01 UTC 2014
>Closed-Date:
>Last-Modified:
>Originator:     Viktor
>Release:        9.2
>Organization:
-
>Environment:
FreeBSD dell 9.2-RELEASE-p1 FreeBSD 9.2-RELEASE-p1 #6: Sun Nov 24 11:20:14 EET 2013     vic at dell:/usr/obj/usr/src/sys/m4500  amd64

cat /dev/sndstat
FreeBSD Audio Driver (newpcm: 64bit 2009061500/amd64)
Installed devices:
pcm0: <NVIDIA GT220 (HDMI/DP 8ch)> (play)
pcm1: <NVIDIA GT220 (HDMI/DP 8ch)> (play)
pcm2: <NVIDIA GT220 (HDMI/DP 8ch)> (play)
pcm3: <NVIDIA GT220 (HDMI/DP 8ch)> (play)
pcm4: <IDT 92HD81B1C (Analog 2.0+HP/2.0)> (play/rec) default
pcm5: <IDT 92HD81B1C (Analog)> (play/rec)

# mixer
Mixer vol      is currently set to  88:88
Mixer pcm      is currently set to  96:96
Mixer speaker  is currently set to  90:90
Mixer line     is currently set to   0:0
Mixer mic      is currently set to  80:80
Mixer mix      is currently set to  59:59
Mixer rec      is currently set to 100:100
Mixer ogain    is currently set to 100:100
>Description:
I have no problem with playing sound, 
I tested it by dd if=<file> of=/dev/dsp 
But the microphone is not working, I didn't hear anything doing dd if=/dev/dsp of=/dev/dsp.

I have such problem not only on my customized kernel (FreeBSD 9.2), but also on the live CD of FreeBSD 10.0. 
I have done a test on the live CD FreeBSD 9.0 - everything OK with playing and recording. Everyting ok with dd if=/dev/dsp of=/dev/dsp test.

>How-To-Repeat:
dd if=/dev/dsp of=/dev/dsp on live-CD 9.0 - everything OK.
dd if=/dev/dsp of=/dev/dsp on live-CD 10.0 - not working.
>Fix:


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