Comment 35 for bug 269586

I recently bought a HP DV7-1003EA, also suffering duff audio, jitter, echo type effect.

Looking at /proc/interrupts, I realised I wasn't getting any interrupts from the codec (cat /proc/asound/card0/codec#0 tells me it is an IDT 92HD71B7X), so I assumed it wasn't getting initialised properly. Not sure the snd-hda-intel driver knows what it is really, so went searching for a way to educate it.

Entering

   echo "options snd-hda-intel enable_msi=1" >> /etc/modprobe.d/alsa-base

into a root console and rebooting has done the trick. Thanks guys!