Re: [Alsa-user] arecord: set_params:1239: Channels count non available

[Clemens L. <cla...@go...>]

Roger wrote:
> I keep getting the following error whenever specifying -c 1 or --channels=1, or
> specifying any number of channels less than two channels when using an ASUS
> Essence STX soundcard and recording using the microphone line having a TRS
> jack.

The CMI8788 chip supports only channel pairs.

> If I'm not mistaken, the jacks are wired to detect when a TS or TRS phone jack
> is inserted.

There is no such detection.  When "Line" is selected as capture source,
the input jack is routed directly to the ADC; when any other sources are
selected, the inputs are routed through the analog section of the
CMI9780 chip, which then acts as a microphone preamp and mixer.


Regards,
Clemens