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MPD exception: Failed to read mixer for 'DietPi ALSA': no such mixer control: PCM #6990
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Is the ALSA PCM detected? aplay -l |
root@DietPi:~# aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: BossDAC [BossDAC], device 0: Boss DAC HiFi [Master] pcm512x-hifi-0 [Boss DAC HiFi [Master] pcm512x-hifi-0]
Subdevices: 1/1
Subdevice #0: subdevice #0 |
root@DietPi:~# aplay -L
null
Discard all samples (playback) or generate zero samples (capture)
hw:CARD=BossDAC,DEV=0
BossDAC, Boss DAC HiFi [Master] pcm512x-hifi-0
Direct hardware device without any conversions
plughw:CARD=BossDAC,DEV=0
BossDAC, Boss DAC HiFi [Master] pcm512x-hifi-0
Hardware device with all software conversions
sysdefault:CARD=BossDAC
BossDAC, Boss DAC HiFi [Master] pcm512x-hifi-0
Default Audio Device
dmix:CARD=BossDAC,DEV=0
BossDAC, Boss DAC HiFi [Master] pcm512x-hifi-0
Direct sample mixing device |
root@DietPi:~# amixer
Simple mixer control 'DSP Program',0
Capabilities: enum
Items: 'FIR interpolation with de-emphasis' 'Low latency IIR with de-emphasis' 'High attenuation with de-emphasis' 'Fixed process flow' 'Ringing-less low latency FIR'
Item0: 'FIR interpolation with de-emphasis'
Simple mixer control 'Analogue',0
Capabilities: pvolume
Playback channels: Front Left - Front Right
Limits: Playback 0 - 1
Mono:
Front Left: Playback 1 [100%] [0.00dB]
Front Right: Playback 1 [100%] [0.00dB]
Simple mixer control 'Analogue Playback Boost',0
Capabilities: volume
Playback channels: Front Left - Front Right
Capture channels: Front Left - Front Right
Limits: 0 - 1
Front Left: 0 [0%] [0.00dB]
Front Right: 0 [0%] [0.00dB]
Simple mixer control 'Auto Mute',0
Capabilities: pswitch
Playback channels: Front Left - Front Right
Mono:
Front Left: Playback [on]
Front Right: Playback [on]
Simple mixer control 'Auto Mute Mono',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Auto Mute Time Left',0
Capabilities: enum
Items: '21ms' '106ms' '213ms' '533ms' '1.07s' '2.13s' '5.33s' '10.66s'
Item0: '21ms'
Simple mixer control 'Auto Mute Time Right',0
Capabilities: enum
Items: '21ms' '106ms' '213ms' '533ms' '1.07s' '2.13s' '5.33s' '10.66s'
Item0: '21ms'
Simple mixer control 'Clock Missing Period',0
Capabilities: enum
Items: '1s' '2s' '3s' '4s' '5s' '6s' '7s' '8s'
Item0: '1s'
Simple mixer control 'Deemphasis',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Digital',0
Capabilities: pvolume pswitch
Playback channels: Front Left - Front Right
Limits: Playback 0 - 207
Mono:
Front Left: Playback 207 [100%] [0.00dB] [on]
Front Right: Playback 207 [100%] [0.00dB] [on]
Simple mixer control 'Max Overclock DAC',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 40
Mono: 0 [0%]
Simple mixer control 'Max Overclock DSP',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 40
Mono: 0 [0%]
Simple mixer control 'Max Overclock PLL',0
Capabilities: volume volume-joined
Playback channels: Mono
Capture channels: Mono
Limits: 0 - 20
Mono: 0 [0%]
Simple mixer control 'Volume Ramp Down Emergency Rate',0
Capabilities: enum
Items: '1 sample/update' '2 samples/update' '4 samples/update' 'Immediate'
Item0: '1 sample/update'
Simple mixer control 'Volume Ramp Down Emergency Step',0
Capabilities: enum
Items: '4dB/step' '2dB/step' '1dB/step' '0.5dB/step'
Item0: '4dB/step'
Simple mixer control 'Volume Ramp Down Rate',0
Capabilities: enum
Items: '1 sample/update' '2 samples/update' '4 samples/update' 'Immediate'
Item0: '1 sample/update'
Simple mixer control 'Volume Ramp Down Step',0
Capabilities: enum
Items: '4dB/step' '2dB/step' '1dB/step' '0.5dB/step'
Item0: '1dB/step'
Simple mixer control 'Volume Ramp Up Rate',0
Capabilities: enum
Items: '1 sample/update' '2 samples/update' '4 samples/update' 'Immediate'
Item0: '1 sample/update'
Simple mixer control 'Volume Ramp Up Step',0
Capabilities: enum
Items: '4dB/step' '2dB/step' '1dB/step' '0.5dB/step'
Item0: '1dB/step' |
root@DietPi:~# amixer scontrols
Simple mixer control 'DSP Program',0
Simple mixer control 'Analogue',0
Simple mixer control 'Analogue Playback Boost',0
Simple mixer control 'Auto Mute',0
Simple mixer control 'Auto Mute Mono',0
Simple mixer control 'Auto Mute Time Left',0
Simple mixer control 'Auto Mute Time Right',0
Simple mixer control 'Clock Missing Period',0
Simple mixer control 'Deemphasis',0
Simple mixer control 'Digital',0
Simple mixer control 'Max Overclock DAC',0
Simple mixer control 'Max Overclock DSP',0
Simple mixer control 'Max Overclock PLL',0
Simple mixer control 'Volume Ramp Down Emergency Rate',0
Simple mixer control 'Volume Ramp Down Emergency Step',0
Simple mixer control 'Volume Ramp Down Rate',0
Simple mixer control 'Volume Ramp Down Step',0
Simple mixer control 'Volume Ramp Up Rate',0
Simple mixer control 'Volume Ramp Up Step',0 |
Does it help to raise the As for the missing myMPD volume slider:
Indeed the default MPD ALSA control device name is "PCM", which does not exist in your case. It is strange that I never recognised issues with MPD like that, while "PCM" does not exist in most cases (? okay, on my VMs it exists), as if it usually is smart enough to take the first volume control it finds. Probably the issue here is that there is no master volume control,, but only those per-channel ones. ... Although, it is the same with the "PCM" control here:
In |
Does it help to raise the Analogue Playback Boost values, e.g. via alsamixer? - No |
Ah great, I missed the "Digital" control completely. Probably it is correct here as volume control is done via DSP before the DAC.
Not that I am aware of. Probably it was never different, not sure. Probably the latest RPi kernel has this changed: #6676 One problem with Allo in general is, that the company has shut down, and hence no one really maintains the drivers anymore. It is more luck that e.g. the Boss 2 driver/device tree overlay got fixed after it was broken, by community and the RPi kernel dev efforts. Let's hope that there are sufficient active users of these sound devices, as they are/were pretty good, actually, from what I heared and read. |
Creating a bug report/issue
Required Information
DietPi version
G_DIETPI_VERSION_CORE=9
G_DIETPI_VERSION_SUB=2
G_DIETPI_VERSION_RC=1
G_GITBRANCH='master'
G_GITOWNER='MichaIng'
Distro version
bullseye 1
Kernel version
SBC model
RPi Zero W (armv6l)
Power supply used
5V @1amp
SD card used
Sandisk Ultra 32GB
Additional Information (if applicable)
Software title
MPD
Was the software title installed freshly or updated/migrated?
Fresh Installation
Can this issue be replicated on a fresh installation of DietPi?
Yes
Steps to reproduce
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