MBP 2018 - lags with external display (sometimes)

Discussion in 'MacBook Pro' started by lukasamd, Jul 15, 2019.

  1. lukasamd macrumors newbie


    Feb 21, 2016
    Hello, I have problem with mouse lags on MBP 2018 with external display.
    I use now Yiiama 5K 27" display, but it also occured with old Dell 4K display. I used USB-C <-> DisplayPort cable to connect monitor, resolution, rehresh rate etc. - everything is ok.

    But sometimes, especially after night or some inactivity (computer sleeps), there are a mouse lags on display - everything is ok, but about every 4-6 seconds there is small lag, and then again ok... again lag etc. It's not only on mouse, I can also use touchpad to for example, make "circles" on display, and there is the same problem.

    Solution is to disconnect external display for few seconds (10-15), then connect again - lag disappear. Of course I can also reboot Mac, but it's stupid.

    Do anyone know other, permanent solution for such issue?
  2. MrGunnyPT macrumors 6502


    Mar 23, 2017
    I'm yet to find a fix to this problem ever since the 2015 13" retina MacBook Pro... The only monitors that don't have trouble with this so far at my home are those who directly connect via USB-C
  3. pshufd macrumors 65816

    Oct 24, 2013
    New Hampshire
    I have this on my 2014 MBP but don't have it on my 2015 MBP but the 2015 has a Discrete GPU. I get lost frames watching some video as well.
  4. lukasamd thread starter macrumors newbie


    Feb 21, 2016
    I've been doing a small test since yesterday - just disabled automatic graphics switching in settings.
    It's been good since then, no laggs, no requirement to disconnect and connect again - will test also today.

    But... it's not good solution, because if we are without power connection, drains battery quickly.
    MacOS should have option to force use Intel on battery power, Nvidia Optimus on Windows is much better.
  5. lukasamd thread starter macrumors newbie


    Feb 21, 2016
    Yep, can confirm - if automatic graphics switching is disabled, issue doesn't occur.
    If enabled, sometimes it is.

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4 July 15, 2019