Missunderstanding or a BUG in reported frequencies for audio cards present in system. #432
Description
I use ArchLinux with kernel 6.12.7 with "Zen" patches. HW is ASUS Vivobook 14X pro.
So the problem I'm having is that I can't set pipewire to 96000 sampling rate. I tried all options in pipewire. Nothing helped. But a long time ago it worked fine - I can't remember when (at most week after Baldur's Gate 3 release ;).
What I see in system:
when I do cat /proc/asound/card0/pcm3p/info (no other pcm* files) I can see name: HDMI 0 - it's important.
with cat /proc/asound/card0/codec#0 on top there is:
Codec: ATI R6xx HDMI
Address: 0
AFG Function Id: 0x1 (unsol 0)
Vendor Id: 0x1002aa01
Subsystem Id: 0x00aa0100
Revision Id: 0x100700
No Modem Function Group found
Default PCM:
rates [0x70]: 32000 44100 48000
bits [0x2]: 16
formats [0x1]: PCM
for the other (default) audio card:
cat /proc/asound/card1/pcm0p/info (there is pcm0c file too but I did not check it) gives: name: ALC294 Analog
cat /proc/asound/card1/codec#0 on top:
Codec: Realtek ALC294
Address: 0
AFG Function Id: 0x1 (unsol 1)
Vendor Id: 0x10ec0294
Subsystem Id: 0x10431ab2
Revision Id: 0x100004
No Modem Function Group found
Default PCM:
rates [0x560]: 44100 48000 96000 192000
bits [0xe]: 16 20 24
formats [0x1]: PCM
so as you can see:
- hdmi supports up to 48000
- analog supports up to 192000
I first noticed there is something wrong with alsacap program that reports:
*** Scanning for playback devices ***
Card 0, ID `Generic', name `HD-Audio Generic'
Device 3, ID `HDMI 0', name `HDMI 0', 1 subdevices (1 available)
2..8 channels, sampling rate 32000..192000 Hz
Sample formats: S16_LE, S32_LE
Subdevice 0, name `subdevice #0'
Card 1, ID `Generic_1', name `HD-Audio Generic'
Device 0, ID `ALC294 Analog', name `ALC294 Analog', 1 subdevices (1 available)
2 channels, sampling rate 44100..48000 Hz
Sample formats: S16_LE, S32_LE
Subdevice 0, name `subdevice #0'
As you can see:
- hdmi supports up to 192000
- analog supports up to 48000
so it's... flipped?
here is a output from cat /proc/asound/pcm:
00-03: HDMI 0 : HDMI 0 : playback 1
01-00: ALC294 Analog : ALC294 Analog : playback 1 : capture 1
To confirm this I downloaded flac file with 96000 sample rate and tried to play it with ffmpeg after pipewire,pipewire-pulse,wireplumber services are stopped. I confirmed that these programs are disabled by checking if ps ax | grep wire before and after, also I monitored logs from these services. It reported error for device "hw:1,0" because it could not set sampling rate to 96000. It did not fail on "hw:0,3" but of course I did not hear anything since external monitor is disconnected.
Replay command: ffmpeg -i yuri_korzunov-through-moon_ring-96kHz-24bit.flac -f alsa hw:1,0
the file is some random file found in internet that tested with ffprobe shows that it has sample rate of 96000.
I don't want to attach it since I forgot where I found it ;)
I don't have asound.conf files in /etc/ or ~/.config.
After connecting external monitor alsacap reports max 48000 for both cards. FFmpeg reports sampling rate problem with both audio cards:
[alsa @ 0x586316542b00] sample rate 96000 not available, nearest is 48000
I had this monitor connected before and alsacap reported "flipped" results - not like now that both cards are limited to 48000.
What else can I do to discover the problem?