The chosen answer is incorrect. This is an unnecessary expense and bad advice. The problem occurs in a lot of X range ASUS laptops.
I was able to resolve it (so far) by uninstalling the program called Asus USB Charge+ - I noticed that program is set to disable usb charging when the battery reaches 40% by default, and after reading your post I decided to end the process in task manager and uninstall the program.
I also made several changes to the power plan under advanced, but my gut tells me that was the issue.
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=== Update (05/19/2018) ===
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Choosing Windows 10 balanced power plan under PC Settings.... System.... Power & Sleep.... Click on Additional power settings on the top right under Related settings... Choose Balanced (Recommended) and click on Change plan settings then set the brightness level on battery to 75% or below. Save settings.
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This resolved the issue for me. I was even able to move the Balanced screen brightness level back up to 100% on battery after this without the flickering coming back.
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I hope this helps. The problem was driving me up the wall.
The chosen answer is incorrect. This is an unnecessary expense and bad advice. The problem occurs in a lot of X range ASUS laptops.
I was able to resolve it (so far) by uninstalling the program called Asus USB Charge+ - I noticed that program is set to disable usb charging when the battery reaches 40% by default, and after reading your post I decided to end the process in task manager and uninstall the program.
I also made several changes to the power plan under advanced, but my gut tells me that was the issue.