[systemd-devel] no log information about why machine is sleeping

[George Avrunin]

Hello,

As a result of a major power outage and consequent issues with some
switches, my office workstation, a Dell Precision T1700 running
fully-updated Fedora 34, was off the network for most of last weekend.  As
our department IT staff detected and fixed the switch issues, they noticed
that my workstation was putting itself to sleep when it couldn't connect
to the switch for my floor.  Right now, everything is back up and working,
but they will probably have to replace the switch.

However, I haven't been able to figure out why the machine puts itself to
sleep when it can't reach the switch.  I asked about this on the Fedora
users list (and included the log entries shown below), and Chris Murphy
noted that systemd doesn't normally insert the sleep request in the log,
so it's not possible to determine what caused the sleep request.  He
suggested that I start a thread here to ask if at least a single line of
information about how the sleep is being initiated could be dumped into
the log by default.  

I will experiment with rebooting with systemd.log_level=debug when I know
the switch will be shut down for replacement.  But it would be good to get
more information about what's initiating sleep by default.

Thanks,

  George Avrunin


Here are the relevant log entries from one of the times the machine put
itself to sleep, apparently because it couldn't connect to the network.
If there's more information I can supply, please let me know.

(This starts after power was restored to the building and the machine had
been manually rebooted just to be sure it would go online.)

Aug 06 17:47:32 ext.math.umass.edu kernel:
Lockdown: systemd-logind: hibernation is restricted; see man
kernel_lockdown.7 Aug 06 17:47:32 ext.math.umass.edu kernel: Lockdown:
systemd-logind: hibernation is restricted; see man kernel_lockdown.7
Aug 06 17:47:32 ext.math.umass.edu NetworkManager[2111]: <info>
[1628286452.1872] manager: sleep: sleep requested (sleeping: no  enabled:
yes) Aug 06 17:47:32 ext.math.umass.edu NetworkManager[2111]: <info>
[1628286452.1876] manager: NetworkManager state is now ASLEEP
Aug 06 17:47:32 ext.math.umass.edu ModemManager[1954]: <info>
[sleep-monitor] system is about to suspend
Aug 06 17:47:32 ext.math.umass.edu gnome-shell[4292]: Screen lock is
locked down, not locking
Aug 06 17:47:32 ext.math.umass.edu systemd[1]: Reached target Sleep.
Aug 06 17:47:32 ext.math.umass.edu systemd[1]: Starting System Suspend...
Aug 06 17:47:32 ext.math.umass.edu systemd-sleep[40504]: Suspending
system...
Aug 06 17:47:32 ext.math.umass.edu kernel: PM: suspend entry (deep)
Aug 07 14:09:22 ext.math.umass.edu kernel: Filesystems sync: 0.379 seconds
Aug 07 14:09:22 ext.math.umass.edu kernel: Freezing user space processes
... (elapsed 0.002 seconds) done.
Aug 07 14:09:22 ext.math.umass.edu kernel: OOM killer disabled.
Aug 07 14:09:22 ext.math.umass.edu kernel: Freezing remaining freezable
tasks ... (elapsed 0.001 seconds) done.
Aug 07 14:09:22 ext.math.umass.edu kernel: printk: Suspending console(s)
(use no_console_suspend to debug)
Aug 07 14:09:22 ext.math.umass.edu kernel: serial 00:06: disabled
Aug 07 14:09:22 ext.math.umass.edu kernel: e1000e: EEE TX LPI TIMER:
00000011
Aug 07 14:09:22 ext.math.umass.edu kernel: sd 0:0:0:0: [sda] Synchronizing
SCSI cache
Aug 07 14:09:22 ext.math.umass.edu kernel: sd 1:0:0:0: [sdb] Synchronizing
SCSI cache
Aug 07 14:09:22 ext.math.umass.edu kernel: sd 1:0:0:0: [sdb] Stopping disk
Aug 07 14:09:22 ext.math.umass.edu kernel: sd 0:0:0:0: [sda] Stopping disk
Aug 07 14:09:22 ext.math.umass.edu kernel: PM: suspend devices took 1.031
seconds
Aug 07 14:09:22 ext.math.umass.edu kernel: ACPI: Preparing to enter system
sleep state S3
Aug 07 14:09:22 ext.math.umass.edu kernel: PM: Saving platform NVS memory
Aug 07 14:09:22 ext.math.umass.edu kernel: Disabling non-boot CPUs ...
lines 835-871
etc.
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