Public bug reported:

New laptop - Dell XPS 17, bought in 2020. Upon installation of Ubuntu
21.04 sound does not work at all. System settings only show one audio
output - "Dummy output". Audio input does not have even that, just an
empty drop-down list.

Issue can be fixed if we load a custom sound driver as described here:
https://blog.fts.scot/2020/07/04/dell-xps-2020-how-to-get-audio-working-
on-linux/

That poses a security risk however and according to the author of the
article is not necessary since mainline Kernel release 5.11 now has
required device headers included.

...

lspci output:

user@MYPC:~$ lspci -v | grep -i -A 10 audio
00:1f.3 Multimedia audio controller: Intel Corporation Comet Lake PCH cAVS
        Subsystem: Dell Comet Lake PCH cAVS
        Flags: bus master, fast devsel, latency 64, IRQ 229, IOMMU group 16
        Memory at 609b218000 (64-bit, non-prefetchable) [size=16K]
        Memory at 609b100000 (64-bit, non-prefetchable) [size=1M]
        Capabilities: <access denied>
        Kernel driver in use: sof-audio-pci
        Kernel modules: snd_hda_intel, snd_sof_pci
--
01:00.1 Audio device: NVIDIA Corporation TU106 High Definition Audio Controller 
(rev a1)
        Subsystem: Dell TU106 High Definition Audio Controller
        Flags: bus master, fast devsel, latency 0, IRQ 17, IOMMU group 1
        Memory at 73000000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel

Looked around for soundwire drivers, found this:

user@MYPC:~$ lsmod | grep soundwire
soundwire_intel        40960  2 snd_sof_intel_hda_common,snd_intel_dspcfg
soundwire_generic_allocation    16384  1 soundwire_intel
soundwire_cadence      32768  1 soundwire_intel
soundwire_bus          77824  7 
regmap_sdw,soundwire_intel,snd_soc_rt715,soundwire_generic_allocation,soundwire_cadence,snd_soc_rt711,snd_soc_rt1308_sdw
snd_soc_core          294912  8 
soundwire_intel,snd_sof,snd_sof_intel_hda_common,snd_soc_rt715,snd_soc_hdac_hda,snd_soc_rt711,snd_soc_dmic,snd_soc_rt1308_sdw
snd_pcm               118784  14 
snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec,soundwire_intel,snd_sof,snd_sof_intel_hda_common,snd_sof_intel_ipc,snd_soc_rt715,snd_compress,snd_soc_core,snd_soc_rt711,snd_soc_rt1308_sdw,snd_hda_core,snd_pcm_dmaengine

Maybe using the soundwire_intel driver would fix the problem? Need to
keep digging. Will post an update if I have any progress.

ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: alsa-base 1.0.25+dfsg-0ubuntu7
ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12
Uname: Linux 5.11.0-16-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu65
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  iamarkadyt   1593 F.... pulseaudio
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 23 00:18:15 2021
InstallationDate: Installed on 2021-04-23 (0 days ago)
InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420)
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: TU106 High Definition Audio Controller - HDA NVidia
Symptom_DevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  iamarkadyt   1593 F.... pulseaudio
Symptom_Type: No sound at all
Title: [HDA-Intel - HDA NVidia, playback] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/03/2020
dmi.bios.release: 1.4
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.4.0
dmi.board.name: 0YK6XT
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvr1.4.0:bd09/03/2020:br1.4:svnDellInc.:pnXPS179700:pvr:rvnDellInc.:rn0YK6XT:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 17 9700
dmi.product.sku: 098F
dmi.sys.vendor: Dell Inc.

** Affects: alsa-driver (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug hirsute

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https://bugs.launchpad.net/bugs/1925730

Title:
  Dell XPS 17 (Ubuntu 21.04) - No sound AT ALL upon fresh installation

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