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AMP2 Volume issues

Loren Ward

May 08, 2018 00:02

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I have the AMP2 and my pi working currently, but am having an issue with volume. If I play music, then pause it for 10 or 15 seconds, then play it again, it plays at maximum volume.

I am using bluetooth from my phone to play the music, set up with https://github.com/BaReinhard/Super-Simple-Raspberry-Pi-Audio-Receiver-Install , as this is the only way I've found to actually get audio to play back through the pi via bluetooth. In the setup I used option 2, DAC Standard/Pro, as the documentation says to treat the AMP2 as a DAC+.

On the pi, the volume icon does not work, it says "No volume control on this device" when clicked. I can adjust the volume using sudo amixer set Master X%, but again if I pause the music long enough then start playing again it comes through at full volume. This also ignores the volume setting on the phone.

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11 comments

• 1
  
  HiFiBerry team May 08, 2018 04:15

  Do you have a display or something else connected to the GPIO?

  Best regards,
  Daniel

• 0
  
  Loren Ward May 08, 2018 04:29

  I have the official 7'' touch screen connected to the pi and hifiberry, with a jumper from physical pin 2 and physical pin 14 for power and ground, respectively.

• 1
  
  HiFiBerry team May 08, 2018 04:31

  As long as you did not connect GPIO2/3 this shouldn't be a problem. However, there might be a driver issue with the display driver. Can you try disconnecting the display?

  Best regards,
  Daniel

• 0
  
  Loren Ward May 08, 2018 04:42

  I will give that a try tomorrow, though that would be a big problem for the build :(

• 0
  
  Loren Ward May 08, 2018 23:53

  I don't think it is the LCD screen. What seems to be happening is I set the volume on the pi via the amixer commands, then after it has paused for 10 seconds or so, the volume is reverted to its original level. Any idea how to fix? Is there a software audio controller I should be using? Preferences > Audio Device Settings shows the snd_rpi_hifiberry_dacplus (Alsa mixer) but "No controls visible"

• 0
  
  HiFiBerry team May 09, 2018 01:18

  I can't say if there is any other software running on your system that changes the volume. I can only say that I know of this from only one other person another with a similar problem that had the display connected.

  Best regards,
  Daniel

• 0
  
  Loren Ward May 09, 2018 01:23

  There isn't any other software controlling the volume, what I'm doing to adjust it via GUI is passing in Runtime commands via Java that are literally `sudo amixer set Master X%`

   

  What was the fix regarding the screen? This seems like a pretty significant bug.

• 0
  
  HiFiBerry team May 09, 2018 01:25

  I don't know about any fix with the display. However, if your case, I recommend to check your program. Most likely this is a bug in your own program.

  Best regards,
  Daniel

• 0
  
  Loren Ward May 09, 2018 01:28

  Same things happens when I run `sudo amixer set Master X%` in a terminal. Volume changes until music is paused, then reverts. It was working fine when was using the 3.5mm jack instead

• 0
  
  Loren Ward May 09, 2018 01:34

  Just tested it without the screen, SSHed in to change the volume. Same thing happens, volume is set, then reverts after being paused.

  You can actually watch this happen in real time with `sudo alsamixer` - I set the volume down some using the arrow keys, pause music, then a couple seconds later it pops back up to 100%. None of my scripts are running in the background.

  Edited by Loren Ward May 09, 2018 01:47
• 0
  
  Loren Ward May 09, 2018 05:25

  I wiped the SD card and started over (created an interim image this time) and tried again with no sound card (just using the 3.5mm jack).

  The problem persists, the volume reverts after being paused, so this has nothing to do with the AMP2. I think it must be something that gets set in the bluetooth source/sink install that I've been using.

  Edited by Loren Ward May 09, 2018 05:29