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SubjectRe: n900 audio: any ideas how to get headset speaker to work?
From
2015-02-16 10:57 GMT+01:00 Pavel Machek <pavel@ucw.cz>:
> Ahoj!
>
>> > By default, output goes to loudspeaker (top right relative to
>> > keyboard). Any ideas how to switch it to the speaker on the left or
>> > wired headset? Because I suspect that echo cancelation is not going to
>> > be simple...
>> > Pavel
>> > --
>> > (english) http://www.livejournal.com/~pavelmachek
>> > (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
>>
>> Hi,
>> in case of direct alsa output (not PA), setup is pretty complex.
>> Headphones referenced as line. All audio outputs are differential.
>> Here are controls that affects volumes...
>
> Aha, thanks for nice explanation. Now it starts to make sense... I got
> headset connected to 3.5" jack to work.
>
> Now, I guess I'd like the internal speaker on the left to work,
> too... Aha, so n900 has two stereo "loud" speakers on the keyboard
> part, plus extra speaker on the left display part for communication?
>

Yes, exactly.

> I got the two stereo ones to work now.
>
> Any idea what is the last speaker on display is called? HPCOM? Mono?

In schematics, earphone is connected to Left HP, channel B
(loudspeakers are channel A). But even after enabling all its
controls, earphone stays muted. My N900 may have broken flex causing
my touchscreen problems too. Better try it yourself.

>> global:
>> PCM (volume)
>> left/right DAC mux (below)
>> -- DAC_L1/R1 passes sound to loudspeakers, line, (maybe others)
>> -- DAC_L2/R2 passes sound to loudspeakers, NOT line, (maybe others)
>> -- DAC_L3/R3 passes sound to NOT loudspeakers, line, (maybe others)
>> if DAC_L1/R1 is chosen, you can hear lower volume on both
>> outputs in compare to dedicated outputs (DAC_L2/R2, DAC_L3/R3),
>> probabbly due to higher load of ADC
>>
>>
>> loudspeakers:
>> Speaker function (on)
>> HP (unmute)
>> HP DAC (volume)
>> left HP Mixer DACL1 (below)
>> right HP Mixer DACR1 (below)
>> --unmute theese two, this will pass left channel sound to left
>> channel output and vice versa
>> left HP Mixer DACR1 (below)
>> right HP Mixer DACL1 (below)
>> --mute these two, this controls channel crosstalk ( amount of left
>> channel sound going to right channel output and vice versa)
>>
>> line:
>> line (unmute)
>> line DAC (volume)
>> jack function (headphone)
>> TPA6130A2 Headphone (volume)
>> left Line Mixer DACL1 (below)
>> right Line Mixer DACR1 (below)
>> --unmute theese two, this will pass left channel sound to left
>> channel output and vice versa
>> left Line Mixer DACR1 (below)
>> right Line Mixer DACL1 (below)
>> --mute these two, this controls channel crosstalk ( amount of left
>> channel sound going to right channel output and vice versa)
>
> Thanks a lot!
> Pavel
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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