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PulseAudio treats all outputs as Mono on the PI4 #196

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athrun opened this issue Aug 26, 2020 · 5 comments
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PulseAudio treats all outputs as Mono on the PI4 #196

athrun opened this issue Aug 26, 2020 · 5 comments
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@athrun
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athrun commented Aug 26, 2020 •
edited

Hi!

By default, PulseAudio on the PI4 treats all analog outputs as Mono, including all HDMI outputs.
I was able to track down the issue and discovered it is simply a configuration file issue that has been fixed upstream two years ago.

The PulseAudio version included in the Pi OS is a bit old, but I was able confirm that simply updating the configuration file without upgrading the PulseAudio version will address the problem.

In /usr/share/pulseaudio/alsa-mixer/profile-sets/default.conf, simply comment out the analog-mono section. This will allow the existing stereo-fallback section to take over.

Comment out this section:

#[Mapping analog-mono]
#device-strings = hw:%f
#channel-map = mono
#paths-output = analog-output analog-output-lineout analog-output-speaker analog-output-headphones analog-output-headphones-2 analog-output-mono
#paths-input = analog-input-front-mic analog-input-rear-mic analog-input-internal-mic analog-input-dock-mic analog-input analog-input-mic analog-input-linein analog-input-aux analog-input-video analog-input-tvtuner analog-input-fm analog-input-mic-line analog-input-headset-mic
#priority = 7

I think including this simple change would make a lot of people using their RPi as a workstation connected to an HDMI monitor happy!

Before the change:

Notice how both PulseAudio sinks (headphones and HDMI1) are configured as Mono outputs:

pi@pi ~> pactl list sinks
Sink #0
	State: IDLE
	Name: alsa_output.platform-bcm2835_audio.analog-mono
	Description: Built-in Audio Analog Mono
	Driver: module-alsa-card.c
	Sample Specification: s16le 1ch 44100Hz
	Channel Map: mono
	Owner Module: 6
	Mute: no
	Volume: mono: 65536 / 100% / 0.00 dB
	        balance 0.00
	Base Volume: 65536 / 100% / 0.00 dB
	Monitor Source: alsa_output.platform-bcm2835_audio.analog-mono.monitor
	Latency: 94282 usec, configured 99954 usec
	Flags: HARDWARE DECIBEL_VOLUME LATENCY
	Properties:
		alsa.resolution_bits = "16"
		device.api = "alsa"
		device.class = "sound"
		alsa.class = "generic"
		alsa.subclass = "generic-mix"
		alsa.name = "bcm2835 HDMI 1"
		alsa.id = "bcm2835 HDMI 1"
		alsa.subdevice = "0"
		alsa.subdevice_name = "subdevice #0"
		alsa.device = "0"
		alsa.card = "0"
		alsa.card_name = "bcm2835 HDMI 1"
		alsa.long_card_name = "bcm2835 HDMI 1"
		alsa.driver_name = "snd_bcm2835"
		device.bus_path = "platform-bcm2835_audio"
		sysfs.path = "/devices/platform/soc/fe00b840.mailbox/bcm2835_audio/sound/card0"
		device.form_factor = "internal"
		device.string = "hw:0"
		device.buffering.buffer_size = "8816"
		device.buffering.fragment_size = "2208"
		device.access_mode = "mmap"
		device.profile.name = "analog-mono"
		device.profile.description = "Analog Mono"
		device.description = "Built-in Audio Analog Mono"
		alsa.mixer_name = "Broadcom Mixer"
		module-udev-detect.discovered = "1"
		device.icon_name = "audio-card"
	Ports:
		analog-output: Analog Output (priority: 9900)
	Active Port: analog-output
	Formats:
		pcm

Sink #1
	State: IDLE
	Name: alsa_output.platform-bcm2835_audio.analog-mono.2
	Description: Built-in Audio Analog Mono
	Driver: module-alsa-card.c
	Sample Specification: s16le 1ch 44100Hz
	Channel Map: mono
	Owner Module: 7
	Mute: no
	Volume: mono: 57371 /  88% / -3.47 dB
	        balance 0.00
	Base Volume: 56210 /  86% / -4.00 dB
	Monitor Source: alsa_output.platform-bcm2835_audio.analog-mono.2.monitor
	Latency: 100645 usec, configured 99954 usec
	Flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY
	Properties:
		alsa.resolution_bits = "16"
		device.api = "alsa"
		device.class = "sound"
		alsa.class = "generic"
		alsa.subclass = "generic-mix"
		alsa.name = "bcm2835 Headphones"
		alsa.id = "bcm2835 Headphones"
		alsa.subdevice = "0"
		alsa.subdevice_name = "subdevice #0"
		alsa.device = "0"
		alsa.card = "1"
		alsa.card_name = "bcm2835 Headphones"
		alsa.long_card_name = "bcm2835 Headphones"
		alsa.driver_name = "snd_bcm2835"
		device.bus_path = "platform-bcm2835_audio"
		sysfs.path = "/devices/platform/soc/fe00b840.mailbox/bcm2835_audio/sound/card1"
		device.form_factor = "internal"
		device.string = "hw:1"
		device.buffering.buffer_size = "8816"
		device.buffering.fragment_size = "2208"
		device.access_mode = "mmap"
		device.profile.name = "analog-mono"
		device.profile.description = "Analog Mono"
		device.description = "Built-in Audio Analog Mono"
		alsa.mixer_name = "Broadcom Mixer"
		module-udev-detect.discovered = "1"
		device.icon_name = "audio-card"
	Ports:
		analog-output-headphones: Headphones (priority: 9000)
	Active Port: analog-output-headphones
	Formats:
		pcm

After making the change and running pulseaudio -k:

pi@pi ~> pactl list sinks
Sink #0
	State: IDLE
	Name: alsa_output.platform-bcm2835_audio.stereo-fallback
	Description: Built-in Audio Stereo
	Driver: module-alsa-card.c
	Sample Specification: s16le 2ch 44100Hz
	Channel Map: front-left,front-right
	Owner Module: 6
	Mute: no
	Volume: front-left: 65536 / 100% / 0.00 dB,   front-right: 65536 / 100% / 0.00 dB
	        balance 0.00
	Base Volume: 65536 / 100% / 0.00 dB
	Monitor Source: alsa_output.platform-bcm2835_audio.stereo-fallback.monitor
	Latency: 94145 usec, configured 99954 usec
	Flags: HARDWARE DECIBEL_VOLUME LATENCY 
	Properties:
		alsa.resolution_bits = "16"
		device.api = "alsa"
		device.class = "sound"
		alsa.class = "generic"
		alsa.subclass = "generic-mix"
		alsa.name = "bcm2835 HDMI 1"
		alsa.id = "bcm2835 HDMI 1"
		alsa.subdevice = "0"
		alsa.subdevice_name = "subdevice #0"
		alsa.device = "0"
		alsa.card = "0"
		alsa.card_name = "bcm2835 HDMI 1"
		alsa.long_card_name = "bcm2835 HDMI 1"
		alsa.driver_name = "snd_bcm2835"
		device.bus_path = "platform-bcm2835_audio"
		sysfs.path = "/devices/platform/soc/fe00b840.mailbox/bcm2835_audio/sound/card0"
		device.form_factor = "internal"
		device.string = "hw:0"
		device.buffering.buffer_size = "17632"
		device.buffering.fragment_size = "4416"
		device.access_mode = "mmap"
		device.profile.name = "stereo-fallback"
		device.profile.description = "Stereo"
		device.description = "Built-in Audio Stereo"
		alsa.mixer_name = "Broadcom Mixer"
		module-udev-detect.discovered = "1"
		device.icon_name = "audio-card"
	Ports:
		analog-output: Analog Output (priority: 9900)
	Active Port: analog-output
	Formats:
		pcm

Sink #1
	State: IDLE
	Name: alsa_output.platform-bcm2835_audio.stereo-fallback.2
	Description: Built-in Audio Stereo
	Driver: module-alsa-card.c
	Sample Specification: s16le 2ch 44100Hz
	Channel Map: front-left,front-right
	Owner Module: 7
	Mute: no
	Volume: front-left: 57365 /  88% / -3.47 dB,   front-right: 57365 /  88% / -3.47 dB
	        balance 0.00
	Base Volume: 56210 /  86% / -4.00 dB
	Monitor Source: alsa_output.platform-bcm2835_audio.stereo-fallback.2.monitor
	Latency: 93900 usec, configured 99954 usec
	Flags: HARDWARE HW_MUTE_CTRL HW_VOLUME_CTRL DECIBEL_VOLUME LATENCY 
	Properties:
		alsa.resolution_bits = "16"
		device.api = "alsa"
		device.class = "sound"
		alsa.class = "generic"
		alsa.subclass = "generic-mix"
		alsa.name = "bcm2835 Headphones"
		alsa.id = "bcm2835 Headphones"
		alsa.subdevice = "0"
		alsa.subdevice_name = "subdevice #0"
		alsa.device = "0"
		alsa.card = "1"
		alsa.card_name = "bcm2835 Headphones"
		alsa.long_card_name = "bcm2835 Headphones"
		alsa.driver_name = "snd_bcm2835"
		device.bus_path = "platform-bcm2835_audio"
		sysfs.path = "/devices/platform/soc/fe00b840.mailbox/bcm2835_audio/sound/card1"
		device.form_factor = "internal"
		device.string = "hw:1"
		device.buffering.buffer_size = "17632"
		device.buffering.fragment_size = "4416"
		device.access_mode = "mmap"
		device.profile.name = "stereo-fallback"
		device.profile.description = "Stereo"
		device.description = "Built-in Audio Stereo"
		alsa.mixer_name = "Broadcom Mixer"
		module-udev-detect.discovered = "1"
		device.icon_name = "audio-card"
	Ports:
		analog-output-headphones: Headphones (priority: 9000)
	Active Port: analog-output-headphones
	Formats:
		pcm
@athrun athrun changed the title PulseAudio only treats all output as Mono on the PI4 PulseAudio only treats all outputs as Mono on the PI4 Aug 26, 2020
@athrun athrun changed the title PulseAudio only treats all outputs as Mono on the PI4 PulseAudio treats all outputs as Mono on the PI4 Aug 26, 2020
@athrun athrun mentioned this issue Aug 27, 2020
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@beta-tester
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today (2020-12-07) an upgrade of PulseAudio was released that fixed the issue for me.

pulseaudio-utils (12.2-4+deb10u1+rpi2)
pulseaudio-module-bluetooth (12.2-4+deb10u1+rpi2)
pulseaudio (12.2-4+deb10u1+rpi2)

@XECDesign
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Yup, that update was to fix that issue.

@no-response
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no-response bot commented Dec 22, 2020

This issue has been automatically closed because there has been no response to our request for more information from the original author. With only the information that is currently in the issue, we don't have enough information to take action. Please reach out if you have or find the answers we need so that we can investigate further.

@no-response no-response bot closed this as completed Dec 22, 2020
@nmisha
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nmisha commented Jul 27, 2021

But in original raspberry lite this block uncommented. Why we have the issue?

@lackarice
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nice, help me fix output my problem , thanks a lot!

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