Problems with ASoC and Bluetooth routing

Simon Kagstrom simon.kagstrom at
Sat Feb 28 11:55:23 CET 2009

On Sat, 28 Feb 2009 15:56:30 +0530
Carl Lobo <carllobo at> wrote:

> > My girlfriend in the other end also complained that the sound was
> > so low that it was difficult to hear the conversation.
> Try adusting the modem call volume while on call. Open a port with
> mickeyterm or something and do a AT+CLVL=255 while on the call and see
> if the volume increases.

I tried this, and there is a distinct difference between AT+CLVL=100
and AT+CLVL=255, but the default is already close to the maximum (and
is very low).

> Otherwise your headset should have a volume control as well - I used
> to see some AT command on the RFCOMM control channel when I pressed
> the volume button. But I'm not sure if it works with our software
> though. Maybe we have some mixer control for that?

When playing sound through A2DP, the headset volume control changes the
sound volume. For phone calls though, I hear no change in call volume
when adjusting it (either up or down).

I tried playing with the mixer controls in alsamixer while in-call, but
there was no change in volume or sound in general, which surprised me a

It's still good that the basic functionality works now!

// Simon

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