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ALC286-VC not working on Thinkpad Helix 2nd generation

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Hi all,
i have a Thinkpad Helix 2nd generation (Catalina 10.15.3) which it'is almost perfect working but the sound.
It's a Broadwell platform, with Intel HD Graphics 5300 (working full QE/CI, by 191e8086/16260002, even on external display port). I was able to make it work with success even with the intel 7265 wifi experimental drivers. Even BT is successfully working!
The only thing which is not working is the soundcard:

8086:160C Name: Broadwell-U Audio Controller

it's a Realtek ALC286-VC

There is not any HDEF device, but i have HDAU (look at ioReg)... i tried to setĀ alcid 3 and 11 through AppleALC (Vanilla AppleHDA), but nothing.

I discovered (through Windows), the soundcard is an "I2C sound Realtek" (or i2s?)... but i am not able to convert it to HDA by DSDT/SSDT patches... (i'm supposingĀ this could solve the problem...)
Please help me find a solution
Thank you




Edited by Iceman
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