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$ lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux bullseye/sid
Release: testing
Codename: bullseye
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$ aplay -l
aplay: device_list:274: no soundcards found...
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$ lspci -knn
...
00:1f.3 Multimedia audio controller [0401]: Intel Corporation Cannon Point-LP High Definition Audio Controller [8086:9dc8] (rev 30)
Subsystem: Hewlett-Packard Company Cannon Point-LP High Definition Audio Controller [103c:85e3]
Kernel driver in use: sof-audio-pci
Kernel modules: snd_hda_intel, snd_soc_skl, snd_sof_pci
...
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$ lsmod |egrep ^snd
snd_soc_hdac_hdmi 40960 0
snd_soc_dmic 16384 0
snd_hda_codec_hdmi 73728 0
snd_hda_codec_realtek 126976 0
snd_hda_codec_generic 94208 1 snd_hda_codec_realtek
snd_sof_pci 20480 0
snd_sof_intel_hda_common 81920 1 snd_sof_pci
snd_sof_intel_hda 20480 1 snd_sof_intel_hda_common
snd_sof_intel_byt 20480 1 snd_sof_pci
snd_sof_intel_ipc 20480 1 snd_sof_intel_byt
snd_sof 131072 4 snd_sof_pci,snd_sof_intel_hda_common,snd_sof_intel_byt,snd_sof_intel_ipc
snd_sof_xtensa_dsp 16384 2 snd_sof_intel_hda_common,snd_sof_intel_byt
snd_soc_skl 180224 0
snd_soc_hdac_hda 24576 2 snd_sof_intel_hda_common,snd_soc_skl
snd_hda_ext_core 36864 5 snd_sof_intel_hda_common,snd_soc_hdac_hdmi,snd_soc_hdac_hda,snd_soc_skl,snd_sof_intel_hda
snd_soc_sst_ipc 20480 1 snd_soc_skl
snd_soc_sst_dsp 40960 1 snd_soc_skl
snd_soc_acpi_intel_match 40960 3 snd_sof_pci,snd_sof_intel_hda_common,snd_soc_skl
snd_soc_acpi 16384 4 snd_soc_acpi_intel_match,snd_sof_intel_hda_common,snd_sof_intel_byt,snd_soc_skl
snd_soc_core 278528 6 snd_sof,snd_sof_intel_hda_common,snd_soc_hdac_hdmi,snd_soc_hdac_hda,snd_soc_skl,snd_soc_dmic
snd_compress 28672 1 snd_soc_core
snd_hda_intel 57344 0
snd_intel_dspcfg 24576 4 snd_hda_intel,snd_sof_pci,snd_sof_intel_hda_common,snd_soc_skl
snd_hda_codec 163840 5 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec_realtek,snd_soc_hdac_hda
snd_hda_core 106496 11 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hda_intel,snd_hda_ext_core,snd_hda_codec,snd_hda_codec_realtek,snd_sof_intel_hda_common,snd_soc_hdac_hdmi,snd_soc_hdac_hda,snd_soc_skl,snd_sof_intel_hda
snd_hwdep 16384 1 snd_hda_codec
snd_pcm 131072 9 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,snd_sof,snd_sof_intel_hda_common,snd_soc_hdac_hdmi,snd_soc_core,snd_soc_skl,snd_hda_core
snd_timer 45056 1 snd_pcm
snd 106496 10 snd_hda_codec_generic,snd_hda_codec_hdmi,snd_hwdep,snd_hda_intel,snd_hda_codec,snd_hda_codec_realtek,snd_timer,snd_compress,snd_soc_core,snd_pcm
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$ ls -l /dev/snd/
total 0
crw-rw----+ 1 root audio 116, 1 Jun 29 06:38 seq
crw-rw----+ 1 root audio 116, 33 Jun 29 06:38 timer
Any ideas what might have gone wrong?