I've had this strange issue for a while. Basically if I launch certain games, which output a 100% black screen for an extended time (for example, when loading), the monitor will then go down to lowest brightness afterwards. It seems almost like the monitor doesn't complete the cycle of turning off when it see "nothing" on the screen. I can fix this either by turning the monitor off/on, or by going into the OSD and moving the brightness setting +1, then -1 (which instantly resets it). I've tried fiddling around with a few other OSD setting to see if that is the issue but haven't had any luck. I've also just dug around in the Nvidia control panel, but didn't see anything that could really be related to dimming the screen like it does.
My monitor is an LG34UM65, and GPU is a GTX 980. Not sure which is actually causing the problem. Thanks for any suggestions.