I have apparently the same issue on my Lenovo X1 4th gen since recent
upgrade:
lspci -v | grep -A7 -i "audio"
00:1f.3 Audio device: Intel Corporation Cannon Point-LP High Definition Audio
Controller (rev 11) (prog-if 80)
Subsystem: Lenovo Cannon Point-LP High Definition Audio Controller
Flags: bus master, fast devsel, latency 64, IRQ 16
Memory at ea33c000 (64-bit, non-prefetchable) [size=16K]
Memory at ea000000 (64-bit, non-prefetchable) [size=1M]
Capabilities: <access denied>
Kernel driver in use: snd_soc_skl
Kernel modules: snd_hda_intel, snd_soc_skl, sof_pci_dev
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 19.10
Release: 19.10
Codename: eoan
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https://bugs.launchpad.net/bugs/1856376
Title:
"Dummy Output" -- built-in audio not detected
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