Thanks again for your response Kevin!
some more info on my environment:
kaisenlinuxrolling2.2-amd64-MATE.iso
root@kaisenlinux ~ # ll /boot
insgesamt 89098
7602 -rw-r–r-- 1 root root 7783904 10. Nov 00:22 vmlinuz-6.0.0-1kaisen-amd64
[ 12.244340] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC887-VD: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:line
[ 12.244346] snd_hda_codec_realtek hdaudioC0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[ 12.244351] snd_hda_codec_realtek hdaudioC0D0: hp_outs=1 (0x1b/0x0/0x0/0x0/0x0)
[ 12.244355] snd_hda_codec_realtek hdaudioC0D0: mono: mono_out=0x0
[ 12.244359] snd_hda_codec_realtek hdaudioC0D0: inputs:
[ 12.244365] snd_hda_codec_realtek hdaudioC0D0: Rear Mic=0x18
[ 12.244369] snd_hda_codec_realtek hdaudioC0D0: Front Mic=0x19
[ 12.244375] snd_hda_codec_realtek hdaudioC0D0: Line=0x1a
[ 12.244379] snd_hda_codec_realtek hdaudioC0D0: CD=0x1c
…
[ 12.265211] input: HDA Digital PCBeep as /devices/pci0000:00/0000:00:14.2/sound/card0/input9
[ 12.265355] input: HDA ATI SB Rear Mic as /devices/pci0000:00/0000:00:14.2/sound/card0/input10
[ 12.265644] input: HDA ATI SB Front Mic as /devices/pci0000:00/0000:00:14.2/sound/card0/input11
[ 12.265830] input: HDA ATI SB Line as /devices/pci0000:00/0000:00:14.2/sound/card0/input12
[ 12.265895] input: HDA ATI SB Line Out as /devices/pci0000:00/0000:00:14.2/sound/card0/input13
[ 12.265981] snd_hda_intel 0000:00:14.2: device 1458:a002 is on the power_save denylist, forcing power_save to 0
**kaisenlinux20200114-amd64.iso**
5180 -rw-r--r-- 1 root root 5303616 20. Dez 22:56 vmlinuz-4.19.0-23-amd64
13836 -rw------- 1 root root 14164928 23. Jan 2021 vmlinuz-5.10.10-051010-generic
5320 -rw------- 1 root root 5613952 7. Mär 2020 vmlinuz-5.4.24-kaisenlinux
I booted the kaisenlinuxrolling2.2-amd64-MATE.iso from a Ventoy USB stick into a live session, didn't install it yet, because during my "serious" work I like to listen to internet radio in the background ;)
The kaisenlinux20200114-amd64.iso has been installed on a HD long time (Jan. 2020) ago, and since then been constantly updated by means of `apt dist-upgrade`. No VM involved!