Hardware volume control broken

[ianhaynes]

The hardware volume control has stopped working. This seems to have happened after installing Python etc on the Pi. If I try to change volume, either by clicking the icon or moving the dial, it always goes back to 100%. The mute button doesn't work either. Software volume works correctly.

Does anyone have any suggestions to fix this?

[hondagx35]

Hi ianhaynes,

did you update the kernel?
If so you have to change the mixer settings.
Your debug info will tell you more.

Frank

[ianhaynes]

Can you give me a clue of what to look for?

I do see:

audio_output {
name "IQaudIODAC"
type "alsa"
device "hw:1,0"
mixer_control "PCM"
mixer_type "hardware"
mixer_device "hw:1"
dsd_usb "yes"
auto_resample "no"
auto_format "no"
enabled "yes"
}

I also see what look like a large number of errors further down the debug data (although they don't seem related to the problem):

4.414835] systemd[1]: Cannot add dependency job for unit systemd-journald.service, ignoring: Unit systemd-journald.service is masked.
[ 14.430169] systemd[1]: Cannot add dependency job for unit systemd-journal-flush.service, ignoring: Unit systemd-journal-flush.service is masked.
[ 14.447529] systemd[1]: Cannot add dependency job for unit systemd-logind.service, ignoring: Unit systemd-logind.service is masked.
[ 14.462910] systemd[1]: Cannot add dependency job for unit haveged.service, ignoring: Unit haveged.service failed to load: No such file or directory.
[ 14.480293] systemd[1]: Cannot add dependency job for unit display-manager.service, ignoring: Unit display-manager.service failed to load: No such file or directory.

This is repeated many times.

Ian

[hondagx35]

[ianhaynes]

Sorry. I installed Python but didn't update the kernel.

Looking at the mixer controls I see:

PCM devices: (aplay -L)
--------------------------------------------------
null
Discard all samples (playback) or generate zero samples (capture)
default:CARD=ALSA
bcm2835 ALSA, bcm2835 ALSA
Default Audio Device
sysdefault:CARD=ALSA
bcm2835 ALSA, bcm2835 ALSA
Default Audio Device
default:CARD=IQaudIODAC
IQaudIODAC,
Default Audio Device
sysdefault:CARD=IQaudIODAC
IQaudIODAC,
Default Audio Device

and:

audio_output {
name "IQaudIODAC"
type "alsa"
device "hw:1,0"
mixer_control "PCM"
mixer_type "hardware"
mixer_device "hw:1"
dsd_usb "yes"
auto_resample "no"
auto_format "no"
enabled "yes"
}

I'm still getting my head around all this so bear with me!

[hondagx35]

Hi ianhaynes,

installing Python can not be the reason for your Problems.

Please post the complete debug info.

Frank

[ianhaynes]

Copy of the debug data is at .

Thanks.

[hondagx35]

[ianhaynes]

OK in that case I did upgrade the kernel. I used pacman -Syy to refresh the packages in order to find Python2, as described in this post on using LCD buttons.



Can I change the mixer_control from PCM to Digital somewhere in the system?

Your help appreciated.

Ian

[ianhaynes]

I've just looked back at a debug log I'd pasted in January when, as far as I recall, the volume control was working, and the mixer_control is set to PCM there. ???



Ian