Chosen Solution
I recently purchased a Dell P2415Q 4K Monitor for my MacBook Pro 15" Touch Bar 2018. When I connect the monitor to my MacBook using a Type-C to DisplayPort cable, the monitor would flicker when certain images are displayed. Here’s a video of what the flickering looks like. The monitor is not damaged, as I tried the same images using my Fire TV Stick and Cube (HDMI). It’s also fine when I hooked up my friend’s MBP 13” Touch Bar 2017 (the same C-DP cable), there is no flickering whatsoever. I tried switching cable, and no luck (and wasted 17 dollars). The only thing I can think of is the Radeon GPU—which Mac automatically uses for external display. Did anyone else have the same issue before? I already scheduled a Genius Bar session. I just want to check if there is already an existing solution (no luck with all kinds of Google search either).
This turns out to be a software issue. I am now on macOS Mojave 10.14 and the problem no longer exists.
I am having the same issue on OS 10.13. I was thinking about just updating to the Catalina. Have you done that yet? Does it still fix your issue?
