So I can't find the screen brightness slider or any brightness adjustment option in my power plan options. All I can do is determine when to put the laptop to sleep and when to turn off the display.
It seems like the common solution for many was to go to Device Manager and uninstall the driver under Monitors, then scan for hardware changes. I did that and it didn't work. If it helps, under my Monitors section it says "Generic PnP Monitor".
Update: I've since found a semi-solution. I can adjust the brightness by holding the Fn key and pressing up/down on my arrow keys. However, the brightness sliders are still missing.
Best Answer
If it is a laptop, it will most likely come back if you reinstall manufacturer's management tools software. The are usually full of unwanted stuff, but if you uninstall them, those on screen goodies like screen brightness indicator will go away too.