I changed motherboard on my computer, I now have one with Z68 chipset, and my 
problems with audio have returned. lspci gives this output:
00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family 
High Definition Audio Controller (rev 05)

If I set any audio setup that includes subwoofer (4.1, 5.1) as soon as I
touch volume setting (with keyboard or mouse, any way), the sound
becomes very distorted (see ogg recording I made).

To make the matter worse, I installed 12.04 beta 2 and I have the exact
same problem with audio. The recording I made is from 12.04. Changing
PCM level doesn't help anymore.

** Attachment added: "How crackling now sounds"
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/796262/+attachment/2975204/+files/Record000.ogg

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https://bugs.launchpad.net/bugs/796262

Title:
  Sound on 5.1 system distorted after changing the volume

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