[alsa-devel] Does amixer have commands to turn on / off Codec TWL4030 analog microphone bias voltage output?

Philip Chu Philip.Chu at logicpd.com
Thu Jun 14 07:03:05 CEST 2012

I am using Linux kernel 3.0 and a  Logic PD DM3530 SOM LV, looking for the amixer commands to turn on / off analog microphone bias supply.
Following lines do not have the bias needed for Headset MIC input:

amixer set 'Analog Left AUXL' nocap
amixer set 'Analog Right AUXR' nocap
amixer set 'Analog Left Main Mic' nocap
amixer set 'Analog Left Headset Mic' cap

Anybody can help?


Philip Chu

principal software engineer
LogicPD www.logicpd.com
5 Clock Tower Place, Suite 215
Maynard, MA 01754
Phone: 978-243-2450 Fax: 978-461-1598

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