On more recent kernels legacy HDA stops working for device 8086:9d71:
[ 47.211381] snd_hda_intel 0000:00:1f.3: DSP detected with PCI
class/subclass/prog-if info 0x040100
[ 47.211383] snd_hda_intel 0000:00:1f.3: Digital mics found on
Skylake+ platform, using SST driver
However, only legacy HDA supports it:
00:1f.3 Multimedia audio controller [0401]: Intel Corporation Sunrise
Point-LP HD Audio [8086:9d71] (rev 21)
..
Kernel modules: snd_hda_intel
Ubuntu kernel doesn't select SND_SOC_INTEL_SKYLAKE, which builds
snd-soc-skl, because based on the Kconfig description SOF should support
it.
I wonder if SND_SOC_INTEL_SKYLAKE should be select again?
SOF does not support Skylake and Kabylake, and only the Up2 board for
APL. I am not sure what you mean by 'recent' kernels since this dynamic
selection has been in place for a year now?
At any rate, to make this work again:
1. You can select SND_SOC_INTEL_SKYLAKE or alternatively to be more
accurate:
SND_SOC_INTEL_SKL
SND_SOC_INTEL_APL
SND_SOC_INTEL_KBL
There are known issues with Conexant codecs, typically on HP devices,
only Realtek codecs are supported.
2. In addition you will need to have the topology for SKL/KBL w/ HDaudio
codecs. It's in alsa-topology-conf but would need to be compiled and
installed.
3. UCM files should be already handled in alsa-ucm-conf
Hope this helps
-Pierre
