Yes, this is a known problem and related to shielding/interference with the flat eDP cable. Here is a video that shows the effect of different positions of a flat ferrite ring around the cable:
This is the one that was used in the video if I’m not mistaken:
But there is a much simpler solution which is to just surround part of the cable with tape:
The tape in the photo is this one but other kinds of tape should work just as well:
On IRC Lukas said:
it looks like the most important thing is that the cable doesn’t hug the hatsink nor the module too much. my theory is that it is about ground plane discontinuity
https://mntre.com/reform-irc-logs/2023-10-19.log.html#t13:27:06