External 4k Samsung Monitor Flickers
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I recently purchased a new monitor. It's a 4K 28" Samsung monitor, model U28E850R. It works just fine and looks great when I connected it with a DP cable. However, I noticed the monitor sometimes flickers, which happens randomly. It bothers from time to time and I was thinking returning the monitor. But I later found that if I disable the f.lux, the flicker goes away. It does not flicker all the time. It does not happen right after the monitor is connected. Instead It happens after a while, maybe a few hours, after the monitor has been on. Another thing that I noticed is that almost every time I use the launchpad, the screen flickers. Again, if f.lux is disabled, I don't see the flicker during the launchpad window.
The f.lux upgraded today automatically, but it didn't change the situation. It's a mid 2014 Macbook pro, 15", running on OSX 10.12.4. I have used f.lux for more than a year and have never had the same problem with the Macbook pro's own display. If any additional information is needed, please let me know.
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Sometimes the monitor's "on screen display" will allow you to turn "dynamic" or "magic" modes that react badly to changing content. See if there's anything in there that helps?
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your problem is not to do with f.lux , its becaise bad display port cable, try buying a new one.
I had same problem and solved buying a good dp cable.cheers
