Hi, I'd like to provide an ALSA driver which is designed to support pulseaudio by default (if that is possible). The driver works fine with aplay and alsamixer. It provides 6 channels and volume controls. - One 'Master Playback Volume' (Mono) - One 'PCM Playback Volume' (6 channels) However, when I want to add an alsa-sink in pulseaudio the hw volume is not used. I call: pacmd load-module module-alsa-sink device=hw:2 control='MOST Mixer' syslog says: Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] reserve-wrap.c: Successfully acquired reservation lock on device 'Audio2' Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] reserve-wrap.c: Successfully create reservation lock monitor for device 'Audio2' Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-util.c: Trying hw:2 with SND_PCM_NO_AUTO_FORMAT ... Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-util.c: Managed to open hw:2 Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-util.c: cannot disable ALSA period wakeups Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-util.c: Maximum hw buffer size is 140 ms Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-util.c: Set buffer size first (to 96000 samples), period size second (to 96000 samples). Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-util.c: Device hw:2 doesn't support 44100 Hz, changed to 48000 Hz. Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-util.c: Device hw:2 doesn't support 2 channels, changed to 6. Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-util.c: ALSA period wakeups were not disabled Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-sink.c: Successfully opened device hw:2. Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-sink.c: Successfully enabled mmap() mode. Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-sink.c: Successfully enabled timer-based scheduling mode. Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-util.c: Successfully attached to mixer 'hw:2' Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-mixer.c: Probing path 'MOST Mixer' Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-mixer.c: Probe of element 'MOST Mixer' succeeded (volume=0, switch=0, enumeration=0). Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-sink.c: Probed mixer path MOST Mixer: Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-mixer.c: Path MOST Mixer ((null)), direction=1, priority=0, probed=yes, supported=yes, has_mute=no, has_volume=no, has_dB=no, min_volume=0, max_volume=0, min_dB=inf, max_dB=-inf Dec 21 15:29:49 kar-dk-m21106-m1 kernel: [ 1647.611918] most-snd: volume_info() Dec 21 15:29:49 kar-dk-m21106-m1 kernel: [ 1647.611923] most-snd: volume_get() Dec 21 15:29:49 kar-dk-m21106-m1 kernel: [ 1647.611928] most-snd: volume_info() Dec 21 15:29:49 kar-dk-m21106-m1 kernel: [ 1647.611930] most-snd: volume_get() Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] module-device-restore.c: Restoring volume for sink alsa_output.hw_2. Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] module-device-restore.c: Restored volume: 0: 80% 1: 80% 2: 80% 3: 80% 4: 80% 5: 80% Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] module-device-restore.c: Restoring mute state for sink alsa_output.hw_2. Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: Default and alternate sample rates are the same. Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: Created sink 2 "alsa_output.hw_2" with sample spec s16le 6ch 48000Hz and channel map front-left,front-right,rear-left,rear-right,front-center,lfe Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: alsa.resolution_bits = "16" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: device.api = "alsa" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: device.class = "sound" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: alsa.class = "generic" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: alsa.subclass = "generic-mix" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: alsa.name = "most_snd_tx" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: alsa.id = "mdev0-ep01" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: alsa.subdevice = "0" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: alsa.subdevice_name = "subdevice #0" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: alsa.device = "0" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: alsa.card = "2" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: alsa.card_name = "Microchip MOST:2" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: alsa.long_card_name = "Microchip MOST:2 at usb_device 1-4:1.2, ch 0" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: device.bus_path = "/devices/virtual/sound/card2" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: sysfs.path = "/devices/virtual/sound/card2" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: device.string = "hw:2" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: device.buffering.buffer_size = "80640" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: device.buffering.fragment_size = "5040" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: device.access_mode = "mmap+timer" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: device.description = "Microchip MOST:2" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: alsa.mixer_name = "MOST Mixer" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] sink.c: device.icon_name = "audio-card" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] source.c: Created source 3 "alsa_output.hw_2.monitor" with sample spec s16le 6ch 48000Hz and channel map front-left,front-right,rear-left,rear-right,front-center,lfe Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] source.c: device.description = "Monitor of Microchip MOST:2" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] source.c: device.class = "monitor" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] source.c: device.icon_name = "audio-input-microphone" Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-sink.c: Using 16.0 fragments of size 5040 bytes (8.75ms), buffer size is 80640 bytes (140.00ms) Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-sink.c: Time scheduling watermark is 6.12ms Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-sink.c: hwbuf_unused=0 Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-sink.c: setting avail_min=6427 Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-mixer.c: Activating path MOST Mixer Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-mixer.c: Path MOST Mixer ((null)), direction=1, priority=0, probed=yes, supported=yes, has_mute=no, has_volume=no, has_dB=no, min_volume=0, max_volume=0, min_dB=inf, max_dB=-inf Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-sink.c: Driver does not support hardware volume control, falling back to software volume control. Dec 21 15:29:49 kar-dk-m21106-m1 pulseaudio[1940]: [pulseaudio] alsa-sink.c: Driver does not support hardware mute control, falling back to software mute control. I appreciate any hint that helps to get hw volume control running. Can you help? Best regards Peter
