Thanks,
dmesg shows it is trying to use acpi loader for i2s / baytrail-pcm-audio.
As mentioned above, some indexes are different from what driver expects
As your machine shares the same id's from the Lenovo device we're working on, you can try to use the same ISO:
# ISO link:
It will force the use of atom/sst/sst_acpi loader (intel/fw_sst_0f28.bin fw). After booting, please check if a card was listed:
cat /proc/asound/devices
If yes, we can try changing some alsa controls and replacing a firmware (like described in [1])
But, as I'm warning on Lenovo thread, there's a chance that something wrong with these changes destroy your hardware permanently (audio chip or even entire tablet).
So, if you want to go ahead, do it at your own risk!
Regards,
Pstglia