while Kernel 5.16 was still an rc I testet it due to FUTEX(2).
And I noticed a little film grain on the desktop, which was annoying, but okish.
But it got way worse, when playing games. And in an unregular interval both monitors, but just one at a time, showed just a black screen for a few seconds. I even got some small crackle noises. They are connected with a Lenovo USB-C dock (without DisplayLink) to my laptop. So I put 5.15 back in charge again and everything worked flawlessly. 5.16 was still a rc.
Now I am running 5.16.2 and still having the problem. When I switch back to 5.15, everything works again.
This happens only while using the dock.
I do not see any film grain or hear crackle noises while my system is booting, so before the OS is loaded.
- so, is this a known problem?
- which output of which commands do you need?
- is your way shorter to the Kernel devs?
- do you even need a photo?