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I have two displays connected, a primary (TV) through HDMI 2.1, and a secondary (monitor) through displayport. I only occasionally use the monitor so I leave it disabled, through winkey+P > "Second screen only".

Randomly, I'll hear a device disconnected sound followed by a device connected sound, the TV screen will stutter, and then the monitor will briefly show the "no input detected" message. After enabling PnP event audit logs, I can see several "A new external device was recognized by the system." events:

event viewer screenshot

Any idea of what could be causing it, or how I could disable these hardware detecting events?

The only clue I have is about the times it tends to happen, mostly (but not only) past 8pm. I thought it had to do with Windows detecting a local network device and triggering it, but I disabled network sharing & discovery and it made no difference.

Other things:

  • I'm using Windows 11, but it'd also happen with 10 as well;
  • Replacing the displayport cable didn't help;
  • No changes after upgrading my video card;
  • There are no issues altogether if I just keep the monitor enabled. No signal drops, reconnections nor random stutters.
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1 Answer 1

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  1. The FIRST thing to do is to update your drivers (if you haven't already).

  2. Carefully check all cables (video cable, power cord, etc). Make sure all the connections are solid.

    • It sounds like you've already done this...

  3. Switch monitors:

    • See if the problem moves with the display device, or stays with the video card

  4. Post back what you find!

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  • 1) I did a fresh Win11 install so drivers should be up to date, also tried to install the monitor manufacturer's driver. 2) Yep, done that, since I replaced the cable once. 3) I don't have another displayport monitor, but I ruled out an issue with the port/monitor since there are no issues as long as it remains enabled.
    – RCostanza
    Commented Sep 29, 2022 at 16:51
  • 1) Re drivers: NEVER ASSUME. Sometimes the drivers don't change for YEARS ... sometimes they can change every 15 minutes. I'm sure your drivers are the former ... but it only takes a few moments to LOOK... 3) It's essential that we try to isolate the problem to a) cabling/connectors, b) your PC video card(s)/chip(s), c) the physical display device. Q: Do you have ONE "video card" (e.g. integrated graphics)? Q: Do you have TWO display ports (e.g. an HDMI and a VGA or DVI port)? Q: Can you think of ANY way to isolate to TV or monitor?
    – paulsm4
    Commented Sep 29, 2022 at 18:22

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