After recent upgrade my screen started flickering occasionally. I am not sure what exactly changed, but I definitely upgraded a kernel and most likely Plasma too. First I noticed the issue on Fedora 38, so I upgraded to Fedora 39 in hope it will disappear but it stayed. So now I am running Fedora 39 with kernel 6.6.3 and Plasma 5.27.9.
As for the issue, the internal screen flickers every minute or so. It seems that some artifacts are displayed for a frame or two. See the enclosed screenshot and video (made from a phone, since when recording screen it doesn’t appear). When I have an external display connected the internal screen still flickers but the external does not.
My hardware: Dell XPS 13 9360
CPU: Intel i7-7500U with Intel® HD Graphics 620
Internal screen is 3K 60Hz
External screen is HPU28K 4K 60Hz
I’ve had a fair share of similar issues on X11 but never seen this on Wayland.
Any ideas what could be wrong or how can I debug such issue?