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Ubuntu 12.04 stereo duplex sound problem

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linux-howto

http://askubuntu.com – Ubuntu 12.04; linux-kernel 3.2.0-27; alsa driver ver. 1.0.24 i have some problem with my HDA Intel ALC662 rev1. When i unmuting front mic in alsamixer, noise appear in my speakers in rear panel, but anyone devices is not plugged in in front panel. Besides in pulseaudio-control panel in hardware properties my device set to analog stereo duplex, and i can't set it to analog stereo output beacouse it's always set back to stereo duplex. (HowTos)