linux-kernel - Re: Microphone gain on N900

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Date:   Sat, 4 Mar 2017 18:01:21 +0200
From:   Jarkko Nikula <jarkko.nikula@...mer.com>
To:     Pavel Machek <pavel@....cz>
Cc:     Pali Rohár <pali.rohar@...il.com>,
        Peter Ujfalusi <peter.ujfalusi@...com>, sre@...nel.org,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, tony@...mide.com, khilman@...nel.org,
        aaro.koskinen@....fi, ivo.g.dimitrov.75@...il.com,
        patrikbachan@...il.com, serge@...lyn.com, abcloriens@...il.com
Subject: Re: Microphone gain on N900

On 03/02/17 16:28, Pavel Machek wrote:
> 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.

-- 
Jarkko