[ThinkPad Helix 2nd] No more sound after upgrade 18.04->20.04

[udippel]

(title says it in principle:)

Upgraded from 18.04 to 20.04 yesterday. Now my sound is mum. It is kind of visible, but not as speakers in the tablet part of my convertible. So when removing the tablet from the dock, there is no sound. Shouldn't be a hardware problem, since W10 (dual-boot) plays musics.

(The files are with dock attached, since the tablet on its own has - and that's a bug of *buntu - no right click. So the 'USB ....' shown as audio device is the device in the keyboard dock.)

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: pulseaudio 1:13.99.1-1ubuntu3.6
ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60
Uname: Linux 5.4.0-48-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.9
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: udippel 1580 F.... pulseaudio
 /dev/snd/controlC0: udippel 1580 F.... pulseaudio
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Thu Oct 1 11:40:36 2020
InstallationDate: Installed on 2019-03-14 (566 days ago)
InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: pulseaudio
UpgradeStatus: Upgraded to focal on 2020-09-29 (1 days ago)
dmi.bios.date: 03/24/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: N17ETB2W (2.12 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20CHS1KL00
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50510 WIN
dmi.chassis.asset.tag: BT-56-001476
dmi.chassis.type: 11
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN17ETB2W(2.12):bd03/24/2020:svnLENOVO:pn20CHS1KL00:pvrThinkPadHelix2nd:rvnLENOVO:rn20CHS1KL00:rvrSDK0E50510WIN:cvnLENOVO:ct11:cvrNone:
dmi.product.family: ThinkPad Helix 2nd
dmi.product.name: 20CHS1KL00
dmi.product.sku: LENOVO_MT_20CH_BU_Think_FM_ThinkPad Helix 2nd
dmi.product.version: ThinkPad Helix 2nd
dmi.sys.vendor: LENOVO

[udippel (udippel)]

I would put this on hold until further notice. Probably me not understanding pulse-audio settings correctly. After a lot of fiddling and wild guess it would work, stop with some other settings, and stop, when removing the tablet part off the convertible.