Comment 23 for bug 1915117

@Chris thanks for the heads up!

Still "Dummy output" in the Sound Settings. Here are the steps I followed:

1. Downdloaded and installed the *.deb you pointed to:

$ sudo dpkg -i *.deb

2. Copied the Intel SST firmware binary file to /lib/firmware:

$ sudo cp skl_hda_dsp_generic-tplg.bin /lib/firmware/

3. Rebooted, disabled Secure Boot and selected the new kernel (5.10.0-1025-oem).

In dmesg, I see the following:

$ dmesg | grep snd
[ 10.027748] snd_hda_intel 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if info 0x040100
[ 10.027752] snd_hda_intel 0000:00:1f.3: Digital mics found on Skylake+ platform, using SST driver
[ 10.051128] snd_soc_skl 0000:00:1f.3: DSP detected with PCI class/subclass/prog-if info 0x040100
[ 10.051132] snd_soc_skl 0000:00:1f.3: Digital mics found on Skylake+ platform, using SST driver
[ 10.051879] snd_soc_skl 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[ 10.103255] snd_soc_skl 0000:00:1f.3: Direct firmware load for 9d71-ACRSYS-ACRPRDCT-2-tplg.bin failed with error -2
[ 10.103261] snd_soc_skl 0000:00:1f.3: tplg fw 9d71-ACRSYS-ACRPRDCT-2-tplg.bin load failed with -2, trying alternative tplg name skl_hda_dsp_generic-tplg.bin
[ 10.104296] snd_soc_skl 0000:00:1f.3: ASoC: Parent card not yet available, widget card binding deferred
[ 10.129385] snd_hda_codec_realtek ehdaudio0D0: autoconfig for ALC256: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker
[ 10.129388] snd_hda_codec_realtek ehdaudio0D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[ 10.129389] snd_hda_codec_realtek ehdaudio0D0: hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
[ 10.129390] snd_hda_codec_realtek ehdaudio0D0: mono: mono_out=0x0
[ 10.129390] snd_hda_codec_realtek ehdaudio0D0: inputs:
[ 10.129392] snd_hda_codec_realtek ehdaudio0D0: Internal Mic=0x1a
[ 10.129393] snd_hda_codec_realtek ehdaudio0D0: Headset Mic=0x19

Please see the attached log for full dmesg.