Mac Brightness Settings Not Working?

The macOS pretty much just cruises along functioning like it is supposed to do. Occasionally, a little glitch in the macOS pops up which can be very annoying. Apparently, one of those problems is that people are having trouble making the “Brightness” controls work on their Macs. If you, a friend or family member is having this issue, then read this article listing several troubleshooting steps for a fix.