@franz Yeap! You guessed correctly. I5 10210u. I've been following some bug tracking reported issues. It has not been fully resolved. Some regression issue I think. The flickering happens on the external connected via dP screen from a laptop and caused some FIFO A B issues.
@oros I have these issues both on my laptop and the attached HDMI screen (Intel 8th Gen.). The problem seems more pronounced on the external screen though. I might try switching to 5.10 once it starts bothering me.
@franz do you use modesetting ddx driver or intel driver? Do you experience tearing on both? You can check in Xorg/Wayland logs.