[systemd-devel] how to let systemd hibernate start/stop the swap area?

[Christoph Anton Mitterer]

When I use 
   systemd.log_level=debug systemd.log_target=console
in the kernel parameters, and then do systemctl hibernate during the
system I get:
Mar 29 12:04:48 hbt systemd-logind[780]: Got message type=method_call sender=:1.9 destination=org.freedesktop.login1 path=/org/freedesktop/login1 interface=org.freedesktop.login1.Manager member=SetWallMessage cookie=2 reply_cookie=0 signature=sb error-name=n/a error-message=n/a
Mar 29 12:04:48 hbt systemd-logind[780]: Sent message type=method_return sender=n/a destination=:1.9 path=n/a interface=n/a member=n/a cookie=61 reply_cookie=2 signature=n/a error-name=n/a error-message=n/a
Mar 29 12:04:48 hbt systemd-logind[780]: Got message type=method_call sender=:1.9 destination=org.freedesktop.login1 path=/org/freedesktop/login1 interface=org.freedesktop.login1.Manager member=HibernateWithFlags cookie=3 reply_cookie=0 signature=t error-name=n/a error-message=n/a
Mar 29 12:04:48 hbt systemd-logind[780]: Sleep mode "disk" is supported by the kernel.
Mar 29 12:04:48 hbt systemd-logind[780]: Disk sleep mode "shutdown" is supported by the kernel.
Mar 29 12:04:48 hbt systemd-logind[780]: No possible swap partitions or files suitable for hibernation were found in /proc/swaps.
Mar 29 12:04:48 hbt systemd-logind[780]: Sent message type=error sender=n/a destination=:1.9 path=n/a interface=n/a member=n/a cookie=62 reply_cookie=3 signature=s error-name=org.freedesktop.login1.SleepVerbNotSupported error-message=Not enough swap space for hibernation
Mar 29 12:04:48 hbt systemd-logind[780]: Failed to process message type=method_call sender=:1.9 destination=org.freedesktop.login1 path=/org/freedesktop/login1 interface=org.freedesktop.login1.Manager member=HibernateWithFlags cookie=3 reply_cookie=0 signature=t error-name=n/a error-message=n/a: Not enough swap space for hibernation

Does that mean it's the same problem as with the desktop environment?
I.e. systemdctl first asking logind whether hibernate was available,
before even starting hibernate.target?


Thanks,
Chris.