The last time I successfully changed the brightness I was in linux mint reading a bright white pdf document late in the evening, and I lowered the brightness. When I did this I held the "fn" extra function key and used "f2" and "f3" while a little icon showed on the screen with a bar I could adjust left-right and the brightness varied. I shut down, took out the mint USB and thought nothing of it. I'm not sure whether I had ever adjusted the screen brightness before while in linux before that time.
A few days later I was in windows watching a DVD and wanted to brighten up the picture, but using the function keys didn't work, couldn't get the screen brightness to change.
I have been to the BIOS and switched from what I had before normally special function, hold down extra function key to access f1 through to f12" to the opposite option, and I'm in linux right now and it doesn't seem to be working whichever way I try to use the keys.
Any thoughts on what I might have to do to return things to their previous state? Or whether within windows 8.1 and linux mint there are other ways to change the screen brightness without relying on the special function built into what are otherwise the f2 and f3 keys.
P.S. I'll probably be booted into windows the next time I visit this forum
Edited by rp88, 21 September 2017 - 06:33 PM.
Best fit I can find is "Internal Hardware" though firmware is involved, too.