Configuration issue with Sound Card PCI Express 5.1ch CMI873

[madurani]

Good day,

After installation of mentioned card i found out that audio card was detect by kernel, but channel layout is incorrect. Card is 5.1, but reachable is only surrounds40 (5.1 missing).

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default:CARD=CMI8738
    C-Media CMI8738, C-Media PCI DAC/ADC
    Default Audio Device
sysdefault:CARD=CMI8738
    C-Media CMI8738, C-Media PCI DAC/ADC
    Default Audio Device
front:CARD=CMI8738,DEV=0
    C-Media CMI8738, C-Media PCI DAC/ADC
    Front output / input
rear:CARD=CMI8738,DEV=0
    C-Media CMI8738, C-Media PCI DAC/ADC
    Rear speakers
surround40:CARD=CMI8738,DEV=0
    C-Media CMI8738, C-Media PCI DAC/ADC
    4.0 Surround output to Front and Rear speakers

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# uname -a
Linux pc-marek1 6.6.48-gentoo-x86_64

00:1b.0 Audio device: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller (rev 05)
03:00.1 Audio device: NVIDIA Corporation GK208 HDMI/DP Audio Controller (rev a1)
07:00.0 Multimedia audio controller: C-Media Electronics Inc CMI8738/CMI8768 PCI Audio (rev 10)

loaded module:

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# lsmod | grep cmi
snd_cmipci             57344  2
snd_mpu401_uart        16384  1 snd_cmipci
snd_opl3_lib           20480  1 snd_cmipci
snd_pcm               184320  5 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_cmipci,snd_hda_core
snd                   147456  24 snd_hda_codec_generic,snd_seq,snd_seq_device,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_opl3_lib,snd_timer,snd_mpu401_uart,snd_cmipci,snd_pcm,snd_rawmidi
gameport               24576  1 snd_cmipci

Coud you please advice what can be problem?

[rzdndr]

I am no expert on sound.

Are you using ALSA or PULSEAUDIO? (From the first listing it is ALSA I believe).

You can read more on this in the GENTOO wiki relating to ALSO (https://wiki.gentoo.org/wiki/ALSA) or PULSEAUDIO (https://wiki.gentoo.org/wiki/PulseAudio).

There is a subsection in the ALSA wiki page that might be relevant, in the troubleshooting section regarding HDMI/SPDIF 5.1 and 7.1 speaker testing. That might help.

There is also a link in the PULSEAUDIO wiki page relating to DTS 5.1+ sound via S/PDIF or HDMI using PulseAudio. Maybe that might help.

Regards