No sound after changing volume while playing sound on an in a 4ch or 6ch channel mode

[Bruma]

During playback sound disappears when changing volume on channels PCM, Front, Surround, Headphone or if I mute, un-mute this channels. This only happens in 4 and 6 channel mode, but not in 2 channel mode. I can retrieve sound only if I change back to 2 channel mode and 1st change volume on PCM channel and then on front channel. After that procedure any additional volume changes during playback results sound disappearance also in 2 channel mode.
If I don't change channel mode after reboot (leave it in 2ch), everything works OK, but just with 2 channels.

My hardware is "Audio Chipset ADI AD1986A" onboard motherboard ASUS M2NPV-VM.

lspci
00:10.1 Audio device: nVidia Corporation MCP51 High Definition Audio (rev a2)

aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: NVidia [HDA NVidia], device 0: AD198x Analog [AD198x Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: NVidia [HDA NVidia], device 1: AD198x Digital [AD198x Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

cat /proc/asound/version
Advanced Linux Sound Architecture Driver Version 1.0.14 (Thu May 31 09:03:25 2007 UTC).

cat /proc/version
Linux version 2.6.22-12-generic (buildd@vernadsky) (gcc version 4.1.3 20070831 (prerelease) (Ubuntu 4.1.2-16ubuntu1)) #1 SMP Sun Sep 23 18:11:30 GMT 2007

cat /etc/issue
Ubuntu gutsy (development branch)

This bug is similar (almost duplicate) to expired bug https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.15/+bug/56203.

[Daniel T Chen (crimsun)]

Please execute the alsa-info.sh script referenced from https://wiki.ubuntu.com/DebuggingSoundProblems and attach the URL here.

[Javier Jardón (jjardon)]

We are closing this bug report because it lacks the information we need to investigate the problem, as described in the previous comments. Please reopen it if you can give us the missing information, and don't hesitate to submit bug reports in the future. To reopen the bug report you can click on the current status, under the Status column, and change the Status back to "New". Thanks again!