Continuous crackling from moment Ubuntu starts up.
When playing sound gives interruptions.
I didn't experience any sound problem in Windows before I installed Ubuntu (ubuntu is great btw).
Continuous switching between speakers and headphones in sound settings.
Crackling continues when pulseaudio turned off.
Difficulty adjusting sound levels in alsamixer.
Same problem under all linux OS.
I tried editing sample rate in daemon.conf or tsched=0 in default.pa, checking archlinux site and some basic bug solutions for ALSA,reinstalling different linux OS, but no newbie luck..
there's a short video I made of the problem: https://www.facebook.com/photo.php?v=486149771507522&l=6160322189117296858
see also more info on my system on : ALSA Information Script v 0.4.63 (for linux, kernel, alsa sound info at) http://www.alsa-project.org/db/?f=050330a52b4870e7ed9d72af30adb1a4987e7dcc
and a bug report I posted at http://www.bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1294830 : HP Compaq dc7600 Small Form Factor, Realtek ALC260, Green Line Out, Rear Underruns, dropouts or crackling sound. I received feedback on this but it's too technical for me.
thx for any advice,