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  • Recently I've seen that waking-up may end up with black screen instead of showing locked X11 screen. It is probably some corner case in the graphic driver, since switching to linux console and back solves the problem. Have you tried that - i.e. switching to linux console and back to X? You may also run sshd onn the machine, connect to it over network and check kernel logs remotely (if the framebuffer console approach failed). Commented May 29, 2013 at 9:54
  • @peterph, My system stops the resume process before I get to that point; what you're calling the "linux console" is what I meant by "tty". IOW, yes I've tried 'ctrl-alt-f1', and it doesn't work. I doubt the system would get far enough to start sshd. I have checked kernel logs after rebooting; so far I haven't found anything useful, but would welcome suggestions on what to look for. Thanks for the suggestions. Commented May 29, 2013 at 10:16
  • Also - IIUC, pm-suspend-hybrid calls s2both ... does it do anything else? Is there a reason to use one over the other? (I know this is a different question, but I havent searched for the answer enough to be ready to post it as one - just figured if someone reading this knows the answer offhand ... thanks) Commented May 30, 2013 at 5:55
  • You could also try uninstalling pm-utils (to make sure they don't interfere) and trying to do it the old-fashined way: echo -n disk > /sys/power/state - see Documentation/power/ in kernel source tree, especially basic-pm-debugging.txt. Commented May 30, 2013 at 7:43
  • I tried the /sys/power/state way before, with no luck. Good note on the documentation, I'll check that out. Like I said, I'm curious to know the difference/what pm-things do; I think they are designed to run over s2things, and possibly do other things (change ENV, run other scripts, etc) - eg, probably not a conflict there. Do you actually know that pm-utils can conflict with something? B/c I don't want to start uninstalling stuff 'just cuz'. Commented May 31, 2013 at 2:52