Here are the scenarios:

  1. Suspend and wake with AC adapter plugged in whole time: Works as expected
  2. Suspend or wake without AC adapter (i.e. power state changes in between suspend or wake): Full boot, session lost.
  3. Suspend and wake with no AC adapter: Full boot, session lost.
  4. Suspend and wake with AC adapter, but un-plug it just for a second in between: Full boot, session lost.

I have been searching around and I see others having "can't resume at all after suspend" ( like here or here ). But this is slightly different, in that the machine tries to resume, but boots from scratch instead of a normal resume.

Perhaps this is expected behavior? Does suspend require power? The thing is... this didn't used to happen. Suspend would last for a while even without power in the past.

Might this have something to do with hibernating? is that what I'm looking for? But if so... still, why did it change? I did do an apt update/apt upgrade recently.

What information should I be gathering? I've bee looking through syslog and finding some things that looked interesting, like these:

Sep 4 13:02:00 xxxx systemd-sleep[3368]: Failed to connect to non-global ctrl_ifname: (nil) error: No such file or directory Sep 4 13:02:00 xxxx systemd-sleep[3374]: /lib/systemd/system-sleep/wpasupplicant failed with error code 255.

but searching for them yielded nothing but people having trouble keeping their systems suspended. That is a different problem than i'm having...

Some info:

Model: Dell XPS 15

$ uname -a Linux xxxx 4.10.0-33-generic #37~16.04.1-Ubuntu SMP Fri Aug 11 14:07:24 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux

Thanks in advance.

  • Yes, suspention keeps the RAM 'alive' so it requires some energy. If you have a defective battery (or no battery), what you describe is to be expected. Hibernation isn't enabled by default for a good reason. – user692175 Sep 4 '17 at 21:07
  • I suppose it's possible my battery just went bad within the last 2 weeks, as this wasn't happening 3 weeks ago... – jenming Sep 5 '17 at 3:53

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