Fedora 8, Laptop Improvements
That is so strange. Fedora 8 has some laptop improvements, which include not only better battery management, but also fixes some problems of hibernating/suspending.
Have you tried another Live-CD? Do you have the same problem?
I think it is an interesting problem, because I am using Fedora 7 and I am planning to make a fresh install of Fedora 8, but possibly I will wait.