I've been having this weird "pulsing" on my secondary monitor for a couple of months and can't seem to figure out what's going on. By "pulsing" I mean the second monitor will suddenly become brighter for a split second. Sometimes it does it several times in a row when working with an app on the primary screen, but sometimes it'll just pulse in a repeating pattern every few seconds. It seems to only happen when a monitor is plugged into display port.
I have an MSI 2070 Super video card, which has one HDMI port and three display ports. The affected monitor is plugged into one of the display ports. The unaffected monitor is plugged in via HDMI. Both monitors are Acer XFA240.
I have tried the






