I have a 2011 MBP which is connected to a 1920x1080, 144 Hz monitor. I am using one of these cables to connect it: https://www.amazon.com/gp/product/B00YOQYQWY/ref=oh_aui_detailpage_o03_s01?ie=UTF8&psc=1

On occasion the display will go black for a few seconds before turning back on. It's not actually disconnecting since I would get a notification on my laptop screen of that event. Sometimes I even hear a click noise when this happens.

It only happens when the resolution is set to 1080, even if I lower the refresh rate. At lower resolutions it never happens. If I use the DisableMonitor app to turn off my laptop's main screen my external display will still sometimes black out. It seems to occur regardless of activity, as I can leave it idling with nothing on the screen or I can be playing an intensive game and it won't happen any more or less frequently. This happens on Windows as well.

Anyone know the cause of this?

  • Have you tried using a different cable or connecting the same cable to a different monitor?
    – NoahL
    Jan 12 '17 at 16:47
  • I don't have another cable or monitor to test it with. I did order another cable from a different company (should arrive tomorrow).
    – HDL
    Jan 13 '17 at 14:14
  • Does it sometimes go completely black and you can not seem to get it turned on again?
  • Does the monitor have its own menu button on the monitor itself to change monitor settings?

I aks because sometimes the monitor has its own sleep mode independent from the operating system.

Check the monitor-menu and check what settings are there and try find a manual - either online or the one made out of paper that came with your monitor.

  • The screen only goes out for a few seconds at most. It always comes back. I don't believe it has a sleep mode. It has its own settings but I have DDC/CI turned on.
    – HDL
    Jan 12 '17 at 16:55

For those who may encounter this issue, it was simply a monitor with defective timing. I sent it in for a replacement which doesn't exhibit this problem.

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