Linux: audio broken on XPS 13 9370

Hello,

when I got this laptop with Ubuntu 16.04 everything was working fine but after a firmware upgrade audio stopped working completely on Linux (now Ubuntu 22.04).

It seems to be a known issue as ArchLinux reports audio to be broken as well on 9370 https://wiki.archlinux.org/title/Dell_XPS_13_(9370)

I'm wondering if you are aware of a workaround or if it's possible to downgrade the firmware to an old, working, version.

I've attached some details/logs below.

Thanks,

Stefano

Audio device:

00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21) (prog-if 80)
        Subsystem: Dell Sunrise Point-LP HD Audio
        Flags: bus master, fast devsel, latency 32, IRQ 16
        Memory at dc428000 (64-bit, non-prefetchable) [size=16K]
        Memory at dc400000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: [50] Power Management version 3
        Capabilities: [60] MSI: Enable- Count=1/1 Maskable- 64bit+
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel, snd_soc_skl

Kernel errors

[Sep19 10:11] snd_soc_skl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if info 0x040380
[  +0.019350] snd_hda_intel 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if info 0x040380
[  +0.000214] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[  +0.014010] snd_hda_intel 0000:00:1f.3: spurious response 0x0:0x0, last cmd=0xfff0005
[  +0.000020] snd_hda_intel 0000:00:1f.3: spurious response 0x0:0x0, last cmd=0xfff0005
[  +0.000022] snd_hda_intel 0000:00:1f.3: spurious response 0x0:0x0, last cmd=0xfff0005
[  +0.000021] snd_hda_intel 0000:00:1f.3: spurious response 0x0:0x0, last cmd=0xfff0005
[  +0.000021] snd_hda_intel 0000:00:1f.3: spurious response 0x0:0x0, last cmd=0xfff0005
[  +0.000021] snd_hda_intel 0000:00:1f.3: spurious response 0x0:0x0, last cmd=0xfff0005
[  +0.000021] snd_hda_intel 0000:00:1f.3: spurious response 0x0:0x0, last cmd=0xfff0005
[  +0.000020] snd_hda_intel 0000:00:1f.3: spurious response 0x0:0x0, last cmd=0xfff0005
[  +0.000021] snd_hda_intel 0000:00:1f.3: spurious response 0x0:0x0, last cmd=0xfff0005
[  +0.000021] snd_hda_intel 0000:00:1f.3: spurious response 0x0:0x0, last cmd=0xfff0005
[  +0.007872] hdaudio hdaudioC0D0: no AFG or MFG node found
[  +1.000127] snd_hda_intel 0000:00:1f.3: azx_get_response timeout, switching to polling mode: last cmd=0x200f0000
[  +1.011941] snd_hda_intel 0000:00:1f.3: No response from codec, disabling MSI: last cmd=0x200f0000
[  +1.004147] snd_hda_intel 0000:00:1f.3: azx_get_response timeout, switching to single_cmd mode: last cmd=0x200f0000
[  +0.000457] hdaudio hdaudioC0D2: no AFG or MFG node found
[  +0.000016] snd_hda_intel 0000:00:1f.3: no codecs initialized