New
#21
I think you've just solved this mystery.
My keyboard does is indeed a lighted one, and additionally, my USB headset has an external sound card, both of which I assume would require high amounts of power and would need time to power up before any drivers could be loaded. Those devices are the only devices I experience this issue with, all other USB devices do not seem to be affected during the first few minutes after resuming from hibernation.
So it appears this is a Windows bug then. Unless we can get Microsoft to notice this issue and release and update, it doesn't look like there's anything I can do. I'll mark this as solved.