Comment 21 for bug 1864061

I just upgraded my ubuntu 19.10 and suddenly lost my sound card. Kernel was updated from 5.3.0-40 to 5.3.0-42. This switched the sound driver from snd_hda to snd_soc which sounds very promising but it seems a firmware is missing and it is unclear where we are supposed to get the firmware from.

```
dmesg | grep -C1 -E 'ALSA|HDA|HDMI|sof|snd[_-]|sound|hda.codec|hda.intel'
[ 0.261825] ACPI: Added _OSI(Linux-Dell-Video)
[ 0.261827] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
[ 0.261828] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
--
[ 1.801143] integrity: Loading X.509 certificate: UEFI:db
[ 1.801169] integrity: Loaded X.509 cert 'Microsoft Corporation UEFI CA 2011: 13adbf4309bd82709c8cd54f316ed522988a1bd4'
[ 1.801169] integrity: Loading X.509 certificate: UEFI:db
[ 1.801179] integrity: Loaded X.509 cert 'Microsoft Windows Production PCA 2011: a92902398e16c49778cd90f99e4f9ae17c55af53'
[ 1.801839] ima: Allocated hash algorithm: sha1
--
[ 10.292817] input: ThinkPad Extra Buttons as /devices/platform/thinkpad_acpi/input/input11
[ 10.292946] snd_hda_intel 0000:00:1f.3: Digital mics found on Skylake+ platform, aborting probe
[ 10.295854] iwlwifi 0000:00:14.3: Found debug destination: EXTERNAL_DRAM
--
[ 10.413077] iwlwifi 0000:00:14.3: base HW address: dc:71:96:b9:0a:d2
[ 10.416236] snd_soc_skl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if info 0x040380
[ 10.433330] snd_soc_skl 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[ 10.482071] ieee80211 phy0: Selected rate control algorithm 'iwl-mvm-rs'
--
[ 10.566796] iwlwifi 0000:00:14.3 wlp0s20f3: renamed from wlan0
[ 10.594049] HDMI HDA Codec ehdaudio0D2: Max dais supported: 3
[ 10.596829] snd_soc_skl 0000:00:1f.3: Direct firmware load for 9dc8-LENOVO-TP-N2H-4752-tplg.bin failed with error -2
[ 10.596831] snd_soc_skl 0000:00:1f.3: tplg fw 9dc8-LENOVO-TP-N2H-4752-tplg.bin load failed with -2, falling back to dfw_sst.bin
[ 10.596845] snd_soc_skl 0000:00:1f.3: Direct firmware load for dfw_sst.bin failed with error -2
[ 10.596846] snd_soc_skl 0000:00:1f.3: Fallback tplg fw dfw_sst.bin load failed with -2
[ 10.596849] snd_soc_skl 0000:00:1f.3: Failed to init topology!
[ 10.596850] snd_soc_skl 0000:00:1f.3: ASoC: failed to probe component -2
[ 10.596859] skl_hda_dsp_generic skl_hda_dsp_generic: ASoC: failed to instantiate card -2

```

other people who encounter issues with 5.3.0-42 :
- https://askubuntu.com/questions/1218058/ubuntu-19-10-audio-driver-issue
- https://askubuntu.com/questions/1217949/ubuntu-no-sound-dummy-output-and-no-sound-card-detected

I apologize if this is the wrong place/issue, this is the closest I could find in the tracker