On my MacBook, whenever I wake it up from hibernation, it briefly displays static for about 2 seconds before showing the login screen, very like an untuned analog TV. The problem is purely cosmetic, because after that it functions perfectly. It doesn't seem to happen if I simply sleep it though.
The machine has gone through two OS upgrades, I believe starting from Mountain Lion, which I don't think had the problem, so it may have started with Mavericks, and continues with Yosemite. I currently have everything updated to the latest version.
It's not really a huge issue, but I'd like to fix it if possible. Any ideas?