I have a brand new 2018 MacBook Pro 15 inch and I downloaded macOS Mojave. For some reason, brightness is still at full. When I try to adjust it, the bars tick down but brightness does not change. After exiting the brightness adjustment and going back in, it shows the brightness as full again. Has anyone else encountered this issue? I've tried resetting SMC, NVRAM, and PRAM and nothing did the trick. Please help!