Reproduced this issue on Framework 12 running both Debian Trixie and Fedora 42 as well. Same fix as you mention (shutting lid and opening again) resolves it temporarily.
Emailed support and they asked me to try a third OS (ubuntu) but seeing this thread and people having same issue on Ubuntu seems like a lot of work for little use.
However I am not seeing this issue on Fedora OR arch (running wayland/niri) on my Framework 13.
Maybe thread should be renamed/tagged to reflect that the issue is also in the officially supported distributions.
I get flickering lines on my display. It flickers a couple of times per minute, so really distracting. I get this on Ubuntu 25.04 and on latest Bluefin. I’m in touch with support, but no solution so far.
Jumping in (as you can see by my lack of username this is my first forum post), to confirm I also have this problem on fedora 42 with my framework 12. I really hope framework looks into this as one of my main use cases is using the 12 for watching movies and the flickering hurts my eyes and makes content look awful. It even persists on a restart of the computer, and the screen close fix doesn’t work for me
