Bug 57882

Summary:	Hibernate: 'echo reboot > /sys/power/disk' no longer has any effect
Product:	systemd	Reporter:	bugzilla
Component:	general	Assignee:	systemd-bugs
Status:	RESOLVED FIXED	QA Contact:	systemd-bugs
Severity:	normal
Priority:	medium	CC:	tekrotzen+bugzilla
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
See Also:	https://bugs.freedesktop.org/show_bug.cgi?id=58679
Whiteboard:
i915 platform:		i915 features:

Description bugzilla 2012-12-04 15:32:15 UTC

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.

Comment 1 Lennart Poettering 2013-02-04 21:14:19 UTC

I figure if we fix this we should do this together with

https://bugzilla.freedesktop.org/show_bug.cgi?id=57793

Sounds like both issues could have the same fix.

Comment 2 Zbigniew Jedrzejewski-Szmek 2013-05-15 02:15:28 UTC

Should be possible again after http://cgit.freedesktop.org/systemd/systemd/commit/?id=19adb8a320. The strings written to /sys/power/state and /sys/power/disk can be freely configured (see http://www.freedesktop.org/software/systemd/man/systemd-sleep.conf.html).

Comment 3 bugzilla 2013-05-16 09:37:16 UTC

Yes, in systemd 203 -
    specify your requirements in file /etc/systemd/sleep.conf
    call systemctl hibernate

Many thanks for the fix.

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