You might want to share your setup then.

My HP Pavillon with windows hibernates reliable today, my very old netbook acer with Ubuntu/LXDE did so, too (but that was years ago).

Nowdays I gave up with linux laptops to even enable it, as it is quite complicated to set it up when you dual boot and use encryption. And after I did set it up, it failed over 50% of times on various devices so I did not bother anymore.

Same, the main instabilities come when I go out of hibernation with changed hardware, ie. haven't plugged back the mouse or changed the display from desk to meeting room