How to make a 4.8 kernel config change for I2S sound?
Solution 1:
The option you look for is
CONFIG_ACPI_REV_OVERRIDE_POSSIBLE=y
Set the option to n to switch to I2S mode.
Make sure that you edit kernel config a debian way.
Run
fakeroot debian/rules clean
fakeroot debian/rules editconfigs
Then say "yes" to the flavour you want to edit. When you get into "menuconfig" interface, find the option by pressing / and clear the field by pressing "Space" key.
Then exit the intrface by "ESC" key and save the config.
Now you can build your kernel.