[Xfce-bugs] [Bug 12770] New: Hybrid Sleep support

[bugzilla-daemon at xfce.org]

https://bugzilla.xfce.org/show_bug.cgi?id=12770

            Bug ID: 12770
           Summary: Hybrid Sleep support
    Classification: Xfce
           Product: Xfce4-session
           Version: Unspecified
          Hardware: Other
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: Medium
         Component: General
          Assignee: xfce-bugs at xfce.org
          Reporter: pomidorabelisima at gmail.com
        QA Contact: bjt23 at cornell.edu
                CC: benny at xfce.org, nick at xfce.org
  Target Milestone: Xfce 4.12

Created attachment 6774
  --> https://bugzilla.xfce.org/attachment.cgi?id=6774&action=edit
Hybrid Sleep support

Hybrid Sleep support - "hibernate" and suspend the system

Hybrid Sleep initially only writes hibernation image to SWAP space,
it does not power off the machine, as a whole Suspend To Disk (S4) does,
it rather Suspend To RAM (S3).

The benefit of this combination is pronto RESUME from S3,
whilst in case of battery drained or interruptions in power supply of any kind,
you ain't gonna lose your work.

Hybrid Sleep is the feature of the Linux kernel.
To test it directly via cli:
echo suspend > /sys/power/disk ; echo disk > /sys/power/state

However to make this feature work,
both Suspend To RAM (S3) and Suspend To Disk (S4)
must be provided by the hardware
dmesg:
ACPI: (supports ... S3 S4 ...)
in working order.

Furthermore Suspend To Disk (S4) requires a relatively simple configuration
an appendix to kernel command line:
resume=<path to resume partition>
i.e. directive to utilize particular SWAP space
man 7 dracut.cmdline

Ref.
https://www.kernel.org/doc/Documentation/power/swsusp.txt

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