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I am using an Asus 1005P netbook. What happens is when I wake up the machine from hibernate state, a while later x crashes and goes to low graphics mode.
I have this issue too, and it doesn't appear to me to be specifically due to being a netbook. My Acer eMachines E525 laptop has an attached display, so I'm in dual-screen display. If I boot without the display, it comes out of hibernate clean. If I boot with the display, the hibernation has the same issue as you. I have to logout and back in again for the display to be corrected. I would like to see a fix as well.