I feel like I need to comment here as behaviour of the mce remotes has changed compared to earlier days.
I have a acer mce rc6 remote and receiver.
It had always worked fine in libreelec and still does.
But since ubuntu 16.04 and Windows 10 it doesn't work on neither of these.
Windows 10 barely any buttons work at all, ubuntu 16.04 onwards is pretty much the same but also doesn't wake the computer like it use to.
But to be far through all of this whatever the libreelec guys do it's always worked for me.