26 November 2014

HDMI monitor blinking (flickering)

I have a dual monitor setup at home, one is connected via HDMI and another one through DVI. A couple days back I noticed that the HDMI monitor was blinking very often, it used to go blank for a couple of seconds but the DVI one just worked fine. According to few forum posts the issue was related to graphics driver but in my case the problem was occurring on both Windows 7 as well as ArchLinux so I ruled out the driver issues, my Arch installation uses open source drivers.


Somewhere it was also mentioned that it might have something to do with "ground loop", you can read more about it on Wikipedia. Then I realized I had recently changed the power cords for the HDMI monitor, and the power cord which was in use did not have an earthing pin (3rd big pin in a plug), it looked like this:

When I replaced the 2-pin plug power chord with a 3-pin plug one (the one with the earthing pin) the blinking problem disappeared. So I guess it was related to earthing but not necessarily to ground loop.

5 comments:

  1. This web site may be a walk-through like the information you wanted relating to this and didn’t know who ought to. Glimpse here, and you’ll undoubtedly discover it. laptop repair in leeds

    ReplyDelete
  2. KVM switches are highly demanded in data centers where one employee has to work on multiple systems for different tasks techcody

    ReplyDelete
  3. On top of buying a larger screen, other hardware support for screen resolutions will be needed such as a better graphics card. I tend to tell people that if you are using the monitor for general personal and office use then a screen no larger than 21 inch will suffice. coding monitor

    ReplyDelete
  4. This is another thing you need to check while buying a monitor for the specific need of gaming. Pixel response time refers to the time consumed by LCD pixel to change one color to another, which greatly affects the image quality of the game. gaming monitor 144hz

    ReplyDelete
  5. Thus, I feel simple and genuine presence in the climate. Mad Heroes Mod

    ReplyDelete