I do want to point out that I am liking ubuntu mate so far, but it is annoying that ubuntu always resets my keyboard light to 50%. This is annoying since I am using a laptop, as it uselessly drains power.
The Ubuntu mate team should consider adding some options for the keyboard backlight.
You could have the system remember the last brightness for the keyboard, so people can still use the backlight if they want it.
I hope someone can fix this soon.