Comment 57 for bug 748994

I've solved my problem.
The problem I had was that hibrenation never resume, and finally discover that what was missing was an "resume" entry in grub2 configuration.
I think it has something to do with partition numbers, which in my case have changed, and grub didn't include the swap partition as a resume parameter in the kernel option.

http://wiki.debian.org/Grub#Configuring_grub_v2
By default grub2 in debian will not add 'resume=/dev/swap-partition' option
Hope it helps someone...