My macbook pro 13' 2015 keyboard and track pad not working
I recommend resetting the SMC and the NVRAM (PRAM) 1st and see if they help get the keyboard and/or the trackpad working again.

Since they work on Remix OS it could also be a software issue, after you reset the SMC and NVRAM if neither starts working then try safe mode. If it doesnt work in safe mode (safe boot) then try with another user account. If the same results then you'll need to backup your Mac and then reinstall MacOS.

If it still persists afterwards than it may be a connection error, you'll need to take it to the Apple Store. 

But do everything else 1st.