Thanks to this bugreport [1] now suspend and resume work as expected
on Fedora 21, finally!
Issue was with missing TPM modules! One solution would be to disable
TPM in EFI/BIOS and other to install missing kernel-modules-extra
package.
Now resume finally works!
Also suspend now takes almost twice as long, and screen blinks quite
few more times like this: on-pressed_suspend-off-on-off-on-off
But main thing is that both suspend and resume work now as expected.
[1]
https://bugzilla.redhat.com/show_bug.cgi?id=1164937