[systemd-bugs] [Bug 57882] New: Hibernate: 'echo reboot > /sys/power/disk' no longer has any effect

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=57882

          Priority: medium
            Bug ID: 57882
          Assignee: systemd-bugs at lists.freedesktop.org
           Summary: Hibernate: 'echo reboot > /sys/power/disk' no longer
                    has any effect
        QA Contact: systemd-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: bugzilla at alastairj.plus.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: general
           Product: systemd

Before updating to systemd 196 a few days ago, it was possible to reboot
immediately after hibernating, by setting /sys/power/disk to 'reboot'. This is
useful if you want to, for example, boot up a different Linux distro.

However after upgrading to 196, the system powers down instead.


Carried out by doing the following -
    echo reboot > /sys/power/disk
    systemctl hibernate

Checking /sys/power/disk after doing the 'echo' shows as expected - 
    platform shutdown [reboot] suspend

Checking /sys/power/disk after powering back on and thawing - 
    [platform] shutdown reboot suspend


Journalctl | grep "Hibernation mode" used to produce a single line for the
hibernation -
Nov 30 17:42:17 <hostname> kernel: PM: Hibernation mode set to 'reboot'

Now it gives 2 lines -
Dec 04 11:44:30 <hostname> kernel: PM: Hibernation mode set to 'reboot'
Dec 04 11:44:30 <hostname> kernel: PM: Hibernation mode set to 'platform'


So it looks like the original contents of /sys/power/disk ('reboot') are being
overwritten ('platform') by the 'systemctl hibernate' command.

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