Comment # 28 on bug 905988 from Al Cho

(In reply to Paul Tannington from comment #21)
> Created attachment 615500 [details]
> journalctl output

I found: 
2014-12-01T15:21:07+0000 linux kernel: PM: Starting manual resume from disk
2014-12-01T15:21:07+0000 linux kernel: PM: Hibernation image partition 8:2
present

Did you run "Hibernate" and "Sleep(Suspend to Ram)" at the same testing time?
or you only run one of them ?