I know there are a lot of questions like this here, but I tried them all and I couldn't make them work.
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I have a HP dv6-2190ep laptop.
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My sound card is HDA Intel IDT 92HD75B3X5.
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My Ubuntu is 13.04.
I tried to add options on alsa-base.conf
but I still don't have auto mute option.
I'm completely changing to Ubuntu from Windows and it is important to fix this. I'm around this for about 1 month.
Best Answer
Try removing pulseaudio completely and installing alsa.
Check this out
Remove Pulse Audio
Reboot your computer or stop the pulseaudio daemon.
Install alsa-mixer
If you don't get any sound output run
For more details go to How to Remove PulseAudio & use ALSA in Ubuntu Linux?