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PulseAudio treats all outputs as Mono on the PI4 #196

Closed athrun closed 3 years ago

athrun commented 4 years ago

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
beta-tester commented 3 years ago

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 commented 3 years ago

Yup, that update was to fix that issue.

no-response[bot] commented 3 years ago

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.

nmisha commented 3 years ago

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

lackarice commented 2 years ago

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