Comment 63 for bug 1743094

I note some others have had failures booting 4.15 even though a recent mainline based on 4.15 allowed me to resume my desktop from hibernation successfully.

Probably goes without saying, but saying it anyway. If you don't use the same kernel for boot and for resume, I speculate that could create some issues, so hopefully everyone who is testing a given kernel makes sure they clean boot and hibernate resume using the same grub kernel option. Hibernating with one kernel configuration, and resuming with another would have unknown stability I guess. Sorry to waste time if this is already stated somewhere else.

I'm not sure if it's a freeze or just a graphical issue in my case and there may be two bugs at work here it sounds like. Will try to figure out if mine is indeed a freeze to check Ariel's flagging my reported bug as a duplicate of the one experienced by the OP in this thread.