Comment 10 for bug 525328

I've got the same problem on a Dell D820 with a STAC92XX Analog (HDA Intel) card on both Karmic 64 and Lucid 64 (LiveCD). I tried installing the alsa-backports for Karmic, which didn't help. I tried adding the 'position_fix=1' option which didn't help. I tried various mixer settings using the default mixer, alsamixer and PulseAudio Volume Control. I updated the pulse audio system ppa:ubuntu-audio-dev repo, which didn't help either.

Recording audio via the internal monitor (for example recording audio which is played by Rythmbox) works perfect, but recording using the microphone (either using the built-in mic or using an external mic via the input-jack) results in crackling and popping recordings. This is very annoying when using programs like Skype.