Re: Intel CougarPoint HDMI, no "input source" control

[Thomas Krichel <krichel@xxxxxxxxxxx>]

  Clemens Ladisch writes

> The external mic _is_ selected; this might be done automatically.

> Does the Mic playback volume have any effect on the feedback?

  I am not sure what you mean by feedback here

krichel@trabbi:~$ amixer cset iface=MIXER,name='Mic Playback Volume' 10,10
numid=5,iface=MIXER,name='Mic Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=10,10
  | dBscale-min=-34.50dB,step=1.50dB,mute=0

krichel@trabbi:~$ amixer cset iface=MIXER,name='Mic Playback Volume' 5,5
numid=5,iface=MIXER,name='Mic Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=5,5
  | dBscale-min=-34.50dB,step=1.50dB,mute=0

krichel@trabbi:~$ amixer cset iface=MIXER,name='Mic Playback Volume' 0,0
numid=5,iface=MIXER,name='Mic Playback Volume'
  ; type=INTEGER,access=rw---R--,values=2,min=0,max=31,step=0
  : values=0,0
  | dBscale-min=-34.50dB,step=1.50dB,mute=0

  It makes no difference in my tests.

krichel@trabbi:~$ alias | grep testsound
alias testsound='arecord -r 20000 -d 2 > /tmp/a.waf ; aplay /tmp/a.waf'

krichel@trabbi:~$ testsound 
Recording WAVE 'stdin' : Unsigned 8 bit, Rate 20000 Hz, Mono
Playing WAVE '/tmp/a.waf' : Unsigned 8 bit, Rate 20000 Hz, Mono

  I notice no difference whether external microphone is plugged in
  or out. I therefore think that the external microphone does not work.
  When mic is high and mic boost is up, I hear a white noise on
  the headset and a faint small feedback from the external microphone

> Does "Mic Boost" have any effect?

  It goes up during skype sessions. My correspondants say it is
  better when it is down. But constantly hitting the down arrow
  during a conversation is no fun.

  Cheers,

  Thomas Krichel                    http://openlib.org/home/krichel
                                      http://authorprofile.org/pkr1
                                               skype: thomaskrichel

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