That's weird. I upgraded to the new version of #UbuntuMATE last week, and ever since I can't suspend my system. It's like the feature just vanished, although the suspend *button* is still there.
Nothing else seems to be wrong anywhere else that I can see.
@Nezchan @ubuntumate Ubuntu has had a tradition of breaking and then fixing suspend to RAM in alternating releases for the last 15 years.
It hasn't affected me before, so it's kind of a new experience.
Linux geeks doing what Linux geeks do...