Did you ever find a solution to this problem? I am currently experiencing the exact same symptoms, you are the only other person i could find with this problem but that may be due to my lack of googleing powers. I started a thread on NotebookReview about this issue, but I think I made some progress. Heres the link if you want to check it out http://forum.notebookreview.com/threads/clevo-p-157sm-keyboard-backlight-turns-off-after-hotkey-loads.773496/
Sorry that i'm replying to such an old thread, I haven't made enough posts to get private messaging yet