Dual boot Windows 7 & Ubuntu 10.04.1 LTS (2.6.32-24-generic).
Win does suspend & hibernate fine, ubuntu does neither.
When selected, both just blank the screens and seem to do nothing else.
Fans, discs, etc seem to active/noisy.
And then nothing brings it back to life (wake up), no mouse click/movement, no keyboard key!

Desktop machine with "Pentium(R) Dual-Core CPU E5200 @ 2.50GHz"