Windows 10: Windows 10: Brightness Options Missing?

Maybe its the graphic card driver that remove the option to control screen brightness you will know it after you reboot.

 

It's always possible. I'll let you know after I finally get round to rebooting. If I could find a solution to save all open chrome tabs and restore them all when i reboot it wouldn't be an issue! Problem is I'm having to log every open chrome tab and when you have over 30 it takes a while!

 

Quickly Save Tab Sessions in Chrome Without Installing Extensions - OMG! Chrome!
perhaps?

Otherwise there may be a suitable extension. (This is easy in Firefox).

What repair is it that needs a restart?

If all else fails, try an in-place upgrade repair install which saves all data and programs and most settings.
Sometimes you can spend ages trying to find a specific fix, when that sorts the problem out- unless it's one that isn't resolved by that of course! One useful thing to try before doing that is to create a new user for test purposes. If you see the same problem then it's not user profile corruption, although it could still be something common like a common startup or driver problem etc.