Here are the scenarios:
- Suspend and wake with AC adapter plugged in whole time: Works as expected
- Suspend or wake without AC adapter (i.e. power state changes in between suspend or wake): Full boot, session lost.
- Suspend and wake with no AC adapter: Full boot, session lost.
- 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 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: Failed to connect to non-global ctrl_ifname: (nil) error: No such file or directory
Sep 4 13:02:00 xxxx systemd-sleep: /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...
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.