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.


Setting the soundcard profile was limited in gnome-control-center for a simpler user experience (see bug #972554). This also affects the switching to Analog stereo from Analog duplex stereo. We can still do this with pavucontrol Install pavucontrol. This may also improve the noise you are experiencing when no device is plugged in the input jack.

From the log files attached to bug #1027570 we can see that we try to switch to the microphone port but fail. We may disable the automatic switching by commenting out the following line in /etc/pulse/default.pa to look like this:

# load-module module-switch-on-port-available

This requires editing this file as root (e.g. by running gksu gedit /etc/pulse/default.pa). To take effect we need to restart pulseaudio with

 pulseaudio -k

If that does not help please remove the # again to re-enable switching audio to a new audio port when it becomes available.

  • there is another problem: when i plug the mic on the front panel, the settings of pulseaudio in input options, is shown attached to the front of the mic,but when I plug headphones to the front panel, mic in the input option begins to blink rapidly as if it connects and disconnects – TheSkif Jul 21 '12 at 19:12
  • Try to see if you get any pulseaudio errors from running a pulseaudio log. You may also add any relevant errors to your question. – Takkat Jul 21 '12 at 20:42
  • Looks like there is an issue with your front mic jack detection - it seems to constantly switch from unplugged to plugged and back. Unfortunately I have no good idea why that is - smells of a hardware issue (try to refix cables to your front panel?). – Takkat Jul 22 '12 at 8:48
  • i tested the front panel in M$ Evil 7, there's works fine... but i'll rechecked my hardware. Thanks any way) – TheSkif Jul 22 '12 at 9:04

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