no sound or distorted sound with DAC2 Pro (Raspberry Pi OS)



maybe someone has an idea what could be wrong: I have a HifiBerry DAC2 Pro sitting on a Raspberry Pi 3 B+ but all I get is silence, noise or distorted sounds.


The hardware is detected correctly without any configuration

$ aplay -l
**** 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: 1/1
Subdevice #0: subdevice #0

but for troubleshooting I also tried some options including


and different output format settings in mpd, but nothing helped.

So far I have heard

  • no sound at all or very quiet noise
  • loud noise, that I can turn down using the volume control
  • audio but played too slow and therefore also too low (depending on my settings running I'd say it is running at half or one quarter of the correct speed – Nancy Sinatra sounds like Barry White and the songs are a lot longer than they should be)


I am running Raspbian Pi OS with kernel version

$ uname -a
Linux wip 5.10.52-v8+ #1440 SMP PREEMPT Tue Jul 27 09:56:40 BST 2021 aarch64 GNU/Linu

Some switches, LEDs and rotary encoders are connected to GPIOs 9, 10, 11, 22, 23, 24, 25, 26, 27, but if I didn't mix the numbers up, there should not be a conflict with the Hifiberry DAC+ Pro.

At the beginning I have used the pins with dtoverlays (gpio-shutdown, gpio-key and rotary-encoder), but even with these lines commented out it doesn't work.

Any help would be greatly appreciated!


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