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Hifi Berry Amp2 Only Mono

I've got a new HiFi Berry Amp2.  Installed it on my Rpi 3B+.

Editted the config.txt as instructed.  The device shows up under aplay --list-devices.

However, during a speaker-test, I only get mono output (Both left and right receive the same signal).

Details:

Kernel: Linux 5.4.45-v8-3b41649ff96d-bis+ #2 SMP PREEMPT Tue Jun 16 13:35:27 GMT 2020 aarch64 GNU/Linux

aplay --list-devices

**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 [HiFiBerry DAC+ HiFi pcm512x-hifi-0]
Subdevices: 0/1
Subdevice #0: subdevice #0

dmesg does show some interesting messages:

dmesg | grep hifi

[ 18.222115] snd-rpi-hifiberry-dacplus soc:sound: ASoC: failed to init link HiFiBerry DAC+: -517
[ 18.320716] snd-rpi-hifiberry-dacplus soc:sound: ASoC: failed to init link HiFiBerry DAC+: -517
[ 18.576449] snd-rpi-hifiberry-dacplus soc:sound: pcm512x-hifi <-> 3f203000.i2s mapping ok
[ 18.576477] snd-rpi-hifiberry-dacplus soc:sound: ASoC: no DMI vendor name!

Any suggestions?

 

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