Brightness and video timing out questions

I can’t seem to figure out how to have the brightness save upon a reboot? It always goes back to the brightest setting on a new boot?
Also when watching youtube videos the computer times out unless I move the mouse around? Any fix for that?
Thanks.

One more question.
How do I get ICONS to auto mount to the right of the screen without having to move them there.

Anyone? This doesn’t bug anyone else?