Comment # 4 on bug 1049019 from Takashi Iwai

It's a Kabylake and its native graphics isn't supported by Leap 42.2.  The
backlight control belongs to it.

Leap 42.3 will have the add-on KMP to upgrade the graphics stack, and this
should work better with your machine.

Please open a new report if the bug is still present with the Leap 42.3. 
Thanks.