EDIT: The solution was that it was freesync. Turned it off on my monitor, and that fixed it.
I recently picked up a used RX 6600xt, and ever since the screen will occasionally freeze for 1-2 seconds before returning to normal. As far as I can tell, input and sound work as normal during these. There’s no real pattern either.
I’m on Mint 21.3 Cinnamon, on the 6.5 kernel (there was a sleep related issue for me in the default kernel version). Since getting the GPU, I’ve replaced the CPU and motherboard.
Any guesses as to what this might be, or where to look? I tried checking mint’s logs app and there didn’t seem to be anything associated with it.
Your 6.5 kernel is still quite old. I’d suggest trying a more recent kernel - there have been several AMD-related bugfixes and improvements since then, leading up to the latest stable 6.8.2. I’d also recommend upgrading to the latest Mesa, which is 24.0.4. Now whilst there are PPAs you can add to easily upgrade your Mesa, I wouldn’t recommend that option as it would introduce more instability and can cause issues with future upgrades. Instead, I’d recommend temporarily trying out a distro with a recent kernel+Mesa, such as EndeavourOS, Nobara, Bluefin etc. If you’re still experiencing issues with them, then it’s likely a hardware issue.
I would just boot Fedora and do some testing in the live environment