Hi, may I ask for help with cards/bcm2835.conf for the new RPi? No such config exists yet:

pi@raspberrypi:~ $ strace -f aplay -L 2>&1 | grep -i bcm2835 access("/usr/share/alsa/cards/bcm2835_alsa.conf", R_OK) = -1 ENOENT (No such file or directory)

I understand the _alsa suffix is handled in aliases (e.g. https://www.raspberrypi.org/forums/viewtopic.php?t=221734#p1361104 )

The reason I am looking for this file are Pulseaudio profiles. PA requires front:X, surroundX, hdmi:X, etc. PCM devices, yet non of these are created due to the missing card config:

pi@raspberrypi:~ $ aplay -L default Playback/recording through the PulseAudio sound server null Discard all samples (playback) or generate zero samples (capture) jack JACK Audio Connection Kit pulse PulseAudio Sound Server sysdefault:CARD=ALSA bcm2835 ALSA, bcm2835 ALSA Default Audio Device dmix:CARD=ALSA,DEV=0 bcm2835 ALSA, bcm2835 ALSA Direct sample mixing device dmix:CARD=ALSA,DEV=1 bcm2835 ALSA, bcm2835 IEC958/HDMI Direct sample mixing device dsnoop:CARD=ALSA,DEV=0 bcm2835 ALSA, bcm2835 ALSA Direct sample snooping device dsnoop:CARD=ALSA,DEV=1 bcm2835 ALSA, bcm2835 IEC958/HDMI Direct sample snooping device hw:CARD=ALSA,DEV=0 bcm2835 ALSA, bcm2835 ALSA Direct hardware device without any conversions hw:CARD=ALSA,DEV=1 bcm2835 ALSA, bcm2835 IEC958/HDMI Direct hardware device without any conversions plughw:CARD=ALSA,DEV=0 bcm2835 ALSA, bcm2835 ALSA Hardware device with all software conversions plughw:CARD=ALSA,DEV=1 bcm2835 ALSA, bcm2835 IEC958/HDMI Hardware device with all software conversions usbstream:CARD=ALSA bcm2835 ALSA USB Stream Output

As a result, only the Analog Mono PA profile (based on the only existing hw:0) is available in PA:

D: [pulseaudio] alsa-mixer.c: Checking for playback on Analog Mono (analog-mono) D: [pulseaudio] alsa-util.c: Trying hw:0 with SND_PCM_NO_AUTO_FORMAT ... D: [pulseaudio] alsa-util.c: Managed to open hw:0 ... D: [pulseaudio] alsa-mixer.c: Checking for playback on Analog Stereo (analog-stereo) D: [pulseaudio] alsa-util.c: Trying front:0 with SND_PCM_NO_AUTO_FORMAT ... I: [pulseaudio] (alsa-lib)conf.c: Unknown parameters 0 I: [pulseaudio] (alsa-lib)pcm.c: Unknown PCM front:0 --- D: [pulseaudio] alsa-mixer.c: Checking for playback on Digital Stereo (HDMI) (hdmi-stereo) D: [pulseaudio] alsa-util.c: Trying hdmi:0 with SND_PCM_NO_AUTO_FORMAT ... I: [pulseaudio] (alsa-lib)conf.c: Unknown parameters 0 I: [pulseaudio] (alsa-lib)pcm.c: Unknown PCM hdmi:0 ... D: [pulseaudio] alsa-mixer.c: Checking for playback on Digital Surround 7.1 (HDMI) (hdmi-surround71) D: [pulseaudio] alsa-util.c: Trying hdmi:0 with SND_PCM_NO_AUTO_FORMAT ... I: [pulseaudio] (alsa-lib)conf.c: Unknown parameters 0 I: [pulseaudio] (alsa-lib)pcm.c: Unknown PCM hdmi:0

RPi v.4 has 2 HDMI outputs:

pi@raspberrypi:~ $ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA] Subdevices: 6/7 Subdevice #0: subdevice #0 Subdevice #1: subdevice #1 Subdevice #2: subdevice #2 Subdevice #3: subdevice #3 Subdevice #4: subdevice #4 Subdevice #5: subdevice #5 Subdevice #6: subdevice #6 card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 IEC958/HDMI [bcm2835 IEC958/HDMI] Subdevices: 1/1 Subdevice #0: subdevice #0 card 0: ALSA [bcm2835 ALSA], device 2: bcm2835 IEC958/HDMI1 [bcm2835 IEC958/HDMI1] Subdevices: 1/1 Subdevice #0: subdevice #0

Each is 2 - 8 channel:

pi@raspberrypi:~ $ aplay -v --dump-hw-params -D hw:0,1 /dev/zero Playing raw data '/dev/zero' : Unsigned 8 bit, Rate 8000 Hz, Mono HW Params of device "hw:0,1": -------------------- ACCESS: MMAP_INTERLEAVED RW_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: [32 128] CHANNELS: [2 8] RATE: [44100 192000] PERIOD_TIME: [10000 743039) PERIOD_SIZE: [441 32768] PERIOD_BYTES: [1776 524288] PERIODS: [1 75) BUFFER_TIME: (2296 743039) BUFFER_SIZE: [441 32768] BUFFER_BYTES: [1764 131072] TICK_TIME: ALL

I looked at hdmi section of cards/Intel-HDA.conf but that one is very complicated. May I ask for help how the config should look like to work both for multichannel PCM and digital formats (i.e. support for the AES vars)? I very much appreciate any help.

Best regards,

Pavel.