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DAC+ Pro on Raspberry Pi 4B running Raspberry Pi OS: no sound

Jeffrey Barish

November 22, 2024 17:55

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The OS is the latest (6.6.51), 64 bit. The DAC+ Pro has HW2.6.

I edited config.txt, which is now in /boot/firmware. I commented out "dtparam=audio=on"

I altered the relevant line to "dtoverlay=vc4-kms-v3d,noaudio"

I created an /etc/asound.conf with the optional content (no effect).

I added "force_eeprom_read=0"

I get a sound card (aplay -l) only with "dtoverlay=hifiberry-dac". There is no sound card when I specify hifiberry-dacplus-pro (which is what I actually have). I also tried hifiberry-dacplus-std and hifiberry-dacplus.

Using the only configuration that results in a sound card, I do get audio output, but it is very quiet. alsamixer is up all the way. I am playing a flac using mplayer.

I do not know what to try next.

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9 comments

• 0
  
  Jeffrey Barish November 22, 2024 20:51

  I also tried hifiberryos64. Same: very quiet, with lots of noise/distortion.

• 0
  
  Jeffrey Barish November 23, 2024 15:23

  Here is the amixer output:

  Simple mixer control 'Master',0 
   Capabilities: pvolume pswitch pswitch-joined 
   Playback channels: Front Left - Front Right 
   Limits: Playback 0 - 65536 
   Mono: 
   Front Left: Playback 65536 [100%] [on] 
   Front Right: Playback 65536 [100%] [on] 
  Simple mixer control 'Capture',0 
   Capabilities: cvolume cswitch cswitch-joined 
   Capture channels: Front Left - Front Right 
   Limits: Capture 0 - 65536 
   Front Left: Capture 65536 [100%] [on] 
   Front Right: Capture 65536 [100%] [on]

• 0
  
  Jeffrey Barish November 25, 2024 15:09

  Same result with Raspberry Pi OS (32).

• 0
  
  HiFiBerry team November 25, 2024 17:42

  If the dac-plus-pro driver isn't loading, the card isn't detected. There might be a hardware problem with your Pi. Make sure nothing else is connected to the GPIOs and the DAC is plugged onto the Pi correctly.
  While defective GPIOs are rare, we regularly see these. You might try another Pi.

• 0
  
  Joyce Michael November 26, 2024 08:53

  @snow rider have you solved it yet friend?

• 0
  
  Jeffrey Barish November 26, 2024 15:22

  I discovered that the DAC does load the hifiberry-dac overlay, so I am pretty sure that the RPi is functional and that the DAC is plugged in correctly. However, there was still no sound, of course, as that overlay was not intended for the DAC+ Pro. I noticed that the DAC+ Pro no longer appears on the products page, so I wonder whether the overlay has not gotten some necessary (and pointless) maintenance. I ordered a DAC2 Pro yesterday. I am hoping to have better results with it -- and better sound quality to boot.

• 0
  
  HiFiBerry team November 26, 2024 15:27

  The fact that the hifiberry-dac overlay load does not say anything about the functionality of the Pi's GPIOs. It's basically a "dumb" driver that will load even if no sound card is plugged on. 
  
  The DAC+ Pro has been replaced by the DAC2 Pro. However, that doesn't mean that the DAC+ Pro shouldn't work anymore. Both cards use the same driver. The DAC2 Pro just uses a slightly improved layout and support the DSP add-on card.

• 0
  
  Jeffrey Barish November 26, 2024 15:31

  Ah. In that case, I should also buy a replacement RPi.

• 0
  
  Jeffrey Barish December 03, 2024 16:11

  I replaced both the RPi and the DAC. I am pleased to report that audio is working now.