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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?

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    First find the wake reason in console log. Note the time stamp for it. Now find the WindowServer after that time stamp and copy those lines here. – Ruskes Dec 12 '14 at 10:05
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I've had this issue many times over the years. It's kind of like the video ram gets clogged in a way. I've solved it with a PRAM reset. Restart and before the computer actually starts up hold down Option, Command (⌘), P, and R till you hear the second startup chime. Then release the keys. This should take care of that for a while. If you get it again you can look into a SMC Reset which is a bit more complicated

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