Microphone gain on N900

[Pavel Machek]

Hi!

> >>>> v4.10 works quite nicely on N900, but I still have problems with
> >>>> audio. Even GSM calls would be usable, if I had reasonable volume on
> >>>> microphone and speaker... but I don't.
> >>>>
> >>>> Both speaker and microphone are too quiet. I can get louder output by
> >>>> plugging headset -- good. I can hear the other side nicely, but am
> >>>> too quiet for them. Unfortunately, even if I plug in wired headset,
> >>>> internal microphone is still used.
> >>>>
> >> For me these settings provide reasonable playback and capture volumes
> >> using v4.10.1:
> >>
> >> amixer -D hw:0 set PCM 100%
> >> amixer -D hw:0 set 'Line DAC' 80% on
> >> amixer -D hw:0 set 'Line' on
> >> amixer -D hw:0 set 'Left Line Mixer DACL1' on
> >> amixer -D hw:0 set 'Right Line Mixer DACR1' on
> >> amixer -D hw:0 set 'Jack Function' 'Headphone'
> >> amixer -D hw:0 set 'TPA6130A2 Headphone' 80%
> >>
> >> amixer -D hw:0 set 'Jack Function' 'Headset'
> >> amixer -D hw:0 set 'AGC' off
> >> amixer -D hw:0 set 'Input Select' 'ADC'
> >> amixer -D hw:0 set 'Left PGA Mixer Line1L' on
> >> amixer -D hw:0 set 'Left Line1L Mux' 'differential'
> >> amixer -D hw:0 set 'Right PGA Mixer Line1L' on
> >> amixer -D hw:0 set 'Right Line1L Mux' 'differential'
> >> amixer -D hw:0 set 'ADC HPF Cut-off' '0.0045xFs' 'disabled'
> >> amixer -D hw:0 set PGA 50% on
> >> amixer -D hw:0 cset iface=MIXER,name='PGA Capture Switch',index=0 on
> > 
> > This seems to correspond to volumes I have had before. They are enough
> > for phone call in quiet environment, but not really for normal usage.
> > 
> > Do you have settings where microphone on wired headset works?
> > 
> Those settings above. They are set after putting all volumes to 0 and
> muted. I'm using the Nokia WH-205 headset that came with the phone.

I just wanted to say thank you. I finally got to testing those
settings again, and this time headset microphone definitely works.

Loopback using arecord | aplay now produces reasonable volume of
audio. (Unfortunately, I still have some problems somewhere in the
audio<->GSM path :-( ).

Best regards,
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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