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Default amixer settings for 2011R1-RC3 distro

Question asked by shekharlav on Jun 6, 2012
Latest reply on Dec 21, 2012 by shekharlav



We are using the ADSP BF527 based TLL6527M platform. The uClinux distro is 2011R1-RC3, built with toolchain 2011R1-RC4.


When we boot uClinux on our platform we find that no capture source is set :

Firing 'amixer' gives :


Simple mixer control 'Capture',0                                               

  Capabilities: cvolume cswitch penum                                          

  Capture channels: Front Left - Front Right                                   

  Limits: Capture 0 - 45                                                       

  Front Left: Capture 23 [51%] [0.00dB] [off]                                  

  Front Right: Capture 23 [51%] [0.00dB] [off]


Now to enable capture from say Mic we have to do the follwoing :


amixer cset name='Capture Switch' on

arecord -d 2 | aplay -d 2

amixer sset 'Input Mux' 'Mic'


Note that we had to do a dummy capture - playback before setting Mic.

If this is not done, then the device capture from the given source (Mic in this case) takes a long time to be set, with  'arecord' capturing 'silence' in that duration.


This was not the case in 2010R1-RC4, where the Capture was on by default for Line In, and arecord used to work immediately after boot.


Are there any settings which need to be done during distro compilation?