On Wed, Dec 30, 2020 at 11:58:14PM +0100, Michael wrote:

Hi all,

I'm in need for stereo sound on the headphone jack of a Banana Pi M2 
(Allwinner A31s), but I'm getting only mono differential (I assume at 
least, because I can hear both channels in either speaker).

In alsamixer, there is a switch to select between stereo and mono 
diffential output for the LINE output (that has no notable effect), 
but not for the Headphone output.

Never mind; This happens if you plug a CTIA headset into a OMTP jack.

Michael

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