As of the updates pushed just before Feb. 10, 2018 I can no longer use the brightness keys on my Lenovo Yoga 910 keyboard to adjust brightness. They do nothing. I must use the brightness slider in the power/battery icon in the tray. The brightness keys were working before the update so maybe it is a regression? Some config file got slightly messed up somewhere? On KDE Neon with Plasma 5.12
Oh, no idea if this is related but tapping the lock key and the switch output key produces the letters "l" and "p" respectively (but I have to press them twice to get them to do that?)
Ope I found out what happened, somehow the shortcut got unassigned in the update process it seems. I changed it back to default settings (it was set to nothing) and now it works again
*** This bug has been marked as a duplicate of bug 389845 ***