That's the working configuration in Debian 9 with sound on the same Laptop but other partition.
(There are problems on the Desktop PC with Debian 10 too in pulseaudio. It seems that Debian 9 was the last Debian distribution with sound ...) ii timidity 2.13.2-40.5 amd64 Software sound renderer (MIDI sequencer, MOD player) ii timidity-daemon 2.13.2-40.5 all runs TiMidity++ as a system-wide MIDI sequencer **** Liste der Hardware-Geräte (PLAYBACK) **** Karte 0: Intel [HDA Intel], Gerät 0: STAC9205 Analog [STAC9205 Analog] Sub-Geräte: 1/1 Sub-Gerät #0: subdevice #0 Karte 0: Intel [HDA Intel], Gerät 1: STAC9205 Digital [STAC9205 Digital] Sub-Geräte: 1/1 Sub-Gerät #0: subdevice #0 default Playback/recording through the PulseAudio sound server null Discard all samples (playback) or generate zero samples (capture) pulse PulseAudio Sound Server sysdefault:CARD=Intel HDA Intel, STAC9205 Analog Default Audio Device front:CARD=Intel,DEV=0 HDA Intel, STAC9205 Analog Front speakers surround21:CARD=Intel,DEV=0 HDA Intel, STAC9205 Analog 2.1 Surround output to Front and Subwoofer speakers surround40:CARD=Intel,DEV=0 HDA Intel, STAC9205 Analog 4.0 Surround output to Front and Rear speakers surround41:CARD=Intel,DEV=0 HDA Intel, STAC9205 Analog 4.1 Surround output to Front, Rear and Subwoofer speakers surround50:CARD=Intel,DEV=0 HDA Intel, STAC9205 Analog 5.0 Surround output to Front, Center and Rear speakers surround51:CARD=Intel,DEV=0 HDA Intel, STAC9205 Analog 5.1 Surround output to Front, Center, Rear and Subwoofer speakers surround71:CARD=Intel,DEV=0 HDA Intel, STAC9205 Analog 7.1 Surround output to Front, Center, Side, Rear and Woofer speakers iec958:CARD=Intel,DEV=0 HDA Intel, STAC9205 Digital IEC958 (S/PDIF) Digital Audio Output dmix:CARD=Intel,DEV=0 HDA Intel, STAC9205 Analog Direct sample mixing device dmix:CARD=Intel,DEV=1 HDA Intel, STAC9205 Digital Direct sample mixing device dsnoop:CARD=Intel,DEV=0 HDA Intel, STAC9205 Analog Direct sample snooping device dsnoop:CARD=Intel,DEV=1 HDA Intel, STAC9205 Digital Direct sample snooping device hw:CARD=Intel,DEV=0 HDA Intel, STAC9205 Analog Direct hardware device without any conversions hw:CARD=Intel,DEV=1 HDA Intel, STAC9205 Digital Direct hardware device without any conversions plughw:CARD=Intel,DEV=0 HDA Intel, STAC9205 Analog Hardware device with all software conversions plughw:CARD=Intel,DEV=1 HDA Intel, STAC9205 Digital Hardware device with all software conversions