Solved: Flickering Green Pixels on External Monitor
Long story short, I had the same problem on my laptop: whenever I connected the external UHD monitor on it via HDMI cable, it was displaying flickering green pixels on some areas of the screen.
I tried everything I found on the internet:
- Removing any potential device close-by which could cause the “noise” and interfere with the signal;
- Making sure the HDMI cable was clean and well connected;
- Updating the drivers;
- Checking/testing the video card for potential issues;
- Tweaking video settings from GPU control panel and so on..
What’s more interesting, the cable and external monitor was working just fine on my desktop PC, but not the laptop, both on Linux and Windows.
And they weren’t working on my laptop, both on Linux and Windows.
It seemed like this problem wasn’t coming from the cable, but from the integrated GPU on my laptop which wasn’t able to properly output information at high resolutions.
Nevertheless, I tried another HDMI cable which was shorter and thicker and it still works like a charm, with no issues whatsoever.
The question remains, why the old cable was working on my desktop PC and not on my laptop? Well, I guess as the cable was like 7 meters long, the voltage on a laptop wasn’t enough to transmit high-resolution data without losing it or being corrupted on the way.
Let me know if this solved your problem as well,
Thank you!
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