Hifiberry DAC+, no hardware volume

Help and Support Help
1

Hello,

I have a RaspberryPi 2 with the HiFiBerry DAC+ installed, in Volumio everything works OK except the hardware volume control. If I set the volume control to “Software” it works, but with “Hardware” the value is always 100%.

pi@volumio:~$ uname -a
Linux volumio 3.18.5-v7+ #748 SMP PREEMPT Wed Feb 4 21:33:52 GMT 2015 armv7l GNU/Linux
pi@volumio:~$  aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: sndrpihifiberry [snd_rpi_hifiberry_dacplus], device 0: HiFiBerry DAC+ HiFi pcm512x-hifi-0 []
  Subdevices: 1/1
  Subdevice #0: subdevice #0
pi@volumio:~$  amixer
Simple mixer control 'Playback',0
  Capabilities: volume
  Playback channels: Front Left - Front Right
  Capture channels: Front Left - Front Right
  Limits: 0 - 1
  Front Left: 1 [100%] [0.00dB]
  Front Right: 1 [100%] [0.00dB]
...
Simple mixer control 'Digital',0
  Capabilities: pswitch
  Playback channels: Front Left - Front Right
  Mono:
  Front Left: Playback [on]
  Front Right: Playback [on]
pi@volumio:~$ more /etc/mpd.conf
...
audio_output {

                 type           "alsa"
                 name           "Output"
                 device         "hw:0,0"
                 mixer_control  "Playback Digital"
                 mixer_device   "hw:0"
                 mixer_index    "0"
                 dop    "no"

}

and in dmesg I have the following lines:

[    4.462879] snd-rpi-hifiberry-dacplus sound: ASoC: CPU DAI (null) not registered
[    4.462941] snd-rpi-hifiberry-dacplus sound: snd_soc_register_card() failed: -517
[    4.462972] platform sound: Driver snd-rpi-hifiberry-dacplus requests probe deferral
[    4.508169] snd-rpi-hifiberry-dacplus sound: ASoC: CPU DAI (null) not registered
[    4.513331] bcm2708_i2c 3f804000.i2c: BSC1 Controller at 0x3f804000 (irq 79) (baudrate 100000)
[    4.533334] snd-rpi-hifiberry-dacplus sound: snd_soc_register_card() failed: -517
[    4.545806] platform sound: Driver snd-rpi-hifiberry-dacplus requests probe deferral
[    4.568040] snd-rpi-hifiberry-dacplus sound: pcm512x-hifi <-> 3f203000.i2s mapping ok

Anyone can help me fixing this issue?

Thanks
Luca

2

Hi Luca,

It should work. Using the web interface, all you have to do is:

configuring (Volumio 1.55)

Menu > System > I2S Dac : Hifiberry +

Save & Reboot

I have the following:

[code]volumio@audio359:~$ tail -n 12 /etc/mpd.conf

audio_output {

	 type 		"alsa"
	 name 		"Output"
	 device 	"hw:1,0"
	 mixer_control 	"Playback Digital"
	 mixer_device 	"hw:1"
	 mixer_index 	"0"
	 dop 	"no"

}
[/code]

A 1 where you have a 0.

Both the aplay and amixer give no result.

HTH,

Sven

Your kernel is a newer than mine (stock 1.55):

volumio@audio359:~$ uname -a Linux audio359 3.12.26+ #702 PREEMPT Wed Aug 6 17:43:49 BST 2014 armv6l GNU/Linux

3

Have a look at this older thread: https://volumio.org/forum/volume-control-with-hifiberry-dac-t2452.html

4

It seems to me that the “Simple mixer control” named “Digital” and “Playback” in amixer output lack the pvolume capability, and also the Limits values aren’t correct, because my values are 0 and 1, and from what I saw in other threads the correct values are 0- 255

Volumio is configured correcly, and the output works with software volume. In mpd.conf I think that the number 0 or 1 is related to the physical interface address, in my system the HiFiBerry is card 0 (from output of aplay -l).

My mpd.conf is the same as the one suggested in the other thread, so I really do’nt understand. Cound be a kernel issue?

5

Luca,

I guess very few people understand all those config files and their interactions, Volumio combines many options.

All I know is that for our Audio 359 Player/Streamer, which consists of a Raspberry Pi B+ and a HifiBerry DAC+, we just put Volumio 1.55 on a fresh SD card and only do “Menu > System > I2S Dac : Hifiberry +” followed by a Save & Reboot. After that HW volume control works normally.

Sven