[XPS 8300, Nvidia GPU 51 HDMI/DP, Digital Out, HDMI] RtChanDeadLtChanGarbled

[Mike B]

 Ubuntu 20.04 Using kernel 5.4.0-9-generic, the right channel is dead and the left channel is garbled and has extra volume. Until today (1/21) using kernel 5.3.0-24, the problem did not occur. With a software update done today, now using 5.3.0-24, both channels are garbled, and 5.4.0-9 the problem is as described above.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 5.4.0-9.12-generic 5.4.3
Uname: Linux 5.4.0-9-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu15
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 21 09:47:36 2020
InstallationDate: Installed on 2020-01-13 (8 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200106)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:NVidia failed
Symptom_Card: GK208 HDMI/DP Audio Controller - HDA NVidia
Symptom_Jack: Digital Out, HDMI
Symptom_Type: Only some of outputs are working
Title: [XPS 8300, Nvidia GPU 51 HDMI/DP, Digital Out, HDMI] Playback problem
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/17/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A06
dmi.board.name: 0Y2MRG
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 3
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA06:bd10/17/2011:svnDellInc.:pnXPS8300:pvr:rvnDellInc.:rn0Y2MRG:rvrA00:cvnDellInc.:ct3:cvr:
dmi.product.name: XPS 8300
dmi.sys.vendor: Dell Inc.