Comment by Kliment

After setting up a swap partition of sufficient size, hibernate worked with no issues whatsoever on my very recent hardware and kubuntu. The main reason it's disabled by default on ubuntu is that the default partition setup isn't compatible with hibernation for most memory sizes. You need a swap configuration that's large enough to fit your entire RAM and also your current swap. I find it works at least as well as on any other OS. I currently have it configured to auto-hibernate on low battery or after some number of hours of sleep. From my point of view the Linux community is doing absolutely great on that front, and I've never had a machine where hibernate didn't work correctly. The main issue here is the defaults on one distribution (ubuntu) make it a massive pain to enable.