Danke für deine Antwort!
$ aplay -l
**** Liste der Hardware-Geräte (PLAYBACK) ****
Karte 0: PCH [HDA Intel PCH], Gerät 0: ALC1150 Analog [ALC1150 Analog]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 0: PCH [HDA Intel PCH], Gerät 1: ALC1150 Digital [ALC1150 Digital]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 1: NVidia [HDA NVidia], Gerät 3: HDMI 0 [HDMI 0]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 1: NVidia [HDA NVidia], Gerät 7: HDMI 1 [HDMI 1]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 1: NVidia [HDA NVidia], Gerät 8: HDMI 2 [HDMI 2]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
Karte 1: NVidia [HDA NVidia], Gerät 9: HDMI 3 [HDMI 3]
Sub-Geräte: 1/1
Sub-Gerät #0: subdevice #0
$ dmesg | egrep -i "alsa|snd"
[ 2.624423] snd_hda_intel 0000:01:00.1: Disabling MSI
[ 2.624426] snd_hda_intel 0000:01:00.1: Handle vga_switcheroo audio client
[ 2.638240] snd_hda_codec_realtek hdaudioC0D0: ALC1150: SKU not ready 0x00000000
[ 2.638716] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC1150: line_outs=3 (0x14/0x15/0x16/0x0/0x0) type:line
[ 2.638717] snd_hda_codec_realtek hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[ 2.638718] snd_hda_codec_realtek hdaudioC0D0: hp_outs=1 (0x1b/0x0/0x0/0x0/0x0)
[ 2.638719] snd_hda_codec_realtek hdaudioC0D0: mono: mono_out=0x0
[ 2.638720] snd_hda_codec_realtek hdaudioC0D0: dig-out=0x1e/0x0
[ 2.638721] snd_hda_codec_realtek hdaudioC0D0: inputs:
[ 2.638723] snd_hda_codec_realtek hdaudioC0D0: Front Mic=0x19
[ 2.638724] snd_hda_codec_realtek hdaudioC0D0: Rear Mic=0x18
[ 2.638725] snd_hda_codec_realtek hdaudioC0D0: Line=0x1a
$ head -n 1 /proc/asound/card*/codec#*
==> /proc/asound/card0/codec#0 <==
Codec: Realtek ALC1150
==> /proc/asound/card1/codec#0 <==
Codec: Nvidia GPU 71 HDMI/DP
(Die Boxen sind an dem Realtek-Chip angeschlossen.)