https://bugs.kde.org/show_bug.cgi?id=499105

            Bug ID: 499105
           Summary: plasma will not hibernate or suspend-then-hibernate
                    from the power manager settings
    Classification: Plasma
           Product: plasmashell
           Version: 6.1.5
          Platform: Kubuntu
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: Power management & brightness
          Assignee: plasma-b...@kde.org
          Reporter: droid...@gmail.com
  Target Milestone: 1.0

SUMMARY
the power management settings for suspend only shows sleep or shutdown

STEPS TO REPRODUCE
1. goto settings > power manager > suspend 
2. note options provided
3. no longer shows hibernate after a period of time option

OBSERVED RESULT
PC will only suspend to RAM not to disk

EXPECTED RESULT
plasma offers both suspend and hibernate if they are supported by the firmware


SOFTWARE/OS VERSIONS
Operating System: Kubuntu 24.10
KDE Plasma Version: 6.1.5
KDE Frameworks Version: 6.6.0
Qt Version: 6.6.2
Kernel Version: 6.11.0-13-generic (64-bit)
Graphics Platform: X11
Processors: 28 × Intel® Core™ i7-14700K
Memory: 62.6 GiB of RAM
Graphics Processor: AMD Radeon RX 6800
Manufacturer: Micro-Star International Co., Ltd.
Product Name: MS-7D27
System Version: 1.0

ADDITIONAL INFORMATION

# both of these checks give the result of false
qdbus org.freedesktop.PowerManagement /org/freedesktop/PowerManagement
CanSuspendThenHibernate
qdbus org.freedesktop.PowerManagement /org/freedesktop/PowerManagement
CanHibernate

however running either 

sudo systemctl hibernate
or 
sudo systemctl suspend-then-hibernate

the system behaves as expected, there just seems to be no way to activate these
from the power management setting

also needed to add this parameter to grub for using the /swap partition to
resume.

GRUB_CMDLINE_LINUX="resume=UUID=[swap partition]"

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