Comment 13 for bug 35213

I should point out that hibernate fails for me on my Thinkpad T30 reliably under these conditions:

1) Power is connectioned
2) Click on gnome power manager notification area icon, select hibernate
3) unplug laptop during hibernation process
4) laptop will hang with harddrive activity and sleep status lights lit until the battery runs out.

I seem to be able to hibernate reliably if I'm plugged in and remain plugged in during the process.
I seem to be able to hibernate reliably if I'm not plugged in when I tell it to hibernate.

I haven't yet tried hibernating while unplugged and plugging into AC during the hibernation process.