Comment 8 for bug 35213

Disabling laptop-mode fixed it for me, so it must be a bug in that, kinda sucks though.
I did this
sudo nano /etc/laptop-mode/laptop-mode.conf
and changed it so it is not enabled when on battery. I rebooted (by just using the init scrips to restart it did not work) and suddenly suspend and hibernate work. Although suddenly I cannot open that file so I can show you what I changed. now i get:
nano: error while loading shared libraries: /lib/libncursesw.so.5: cannot read file data: Input/output error

and it opened fine just before i put it to sleep (also put it into hibernation, both worked, and it has worked 5 times in a row so far, so i ma fairly confident that the problem is laptop-mode)