Back in the good ol' 5.2 days, I could routinely use the command 'apm -s' to hibernate my laptop. A click of the Shift key would wake it back to its normal happy self. After upgrading to 6.0, however, I can do this only once. The second time I try it, it seems to perform the sync (there is the normal pre-hibernation disk activity), but then hangs (causing the fan to start, usually). This happens even from the console with very minimal processes running.
Try the current version. Works well for me (Gericom 3XC).