Comment 6 for bug 420578

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Mike Pontillo (mpontillo) wrote : Re: Karmic: PCM volume (as seen in alsamixer) "stuck" at 100% with pulseaudio enabled

   Note, I found that adding the following file to my system helps SOME of the problem:

$ cat /etc/modprobe.d/sound.conf
options snd_hda_intel model=hp

   It seems the snd_hda_intel module has a vast array of options that one needs to sort through in order to get quality sound output. It might be nice to have a robust "detection" scheme to set these options out of the box if a board is detected that needs additional options to work better.

   I was hoping that this would be a 100% acceptable workaround, but I still hear some of the "crackling" from my speakers that caused me to work around the issue by (in previous Ubuntu releases) adjusting the PCM volume down.