https://bugs.kde.org/show_bug.cgi?id=440609

--- Comment #1 from postix <pos...@posteo.eu> ---
I have tried to trigger it again and watched journalctl's output, maybe it
gives a clue:

```
--> Unplug

No log. Displays "on Battery"

-----------------------------------------------------------------------------------------

--> Plug in

Aug 05 16:21:12 fedora kernel: ucsi_acpi USBC000:00: UCSI_GET_PDOS failed (-95)

Displays "AC power connected"

-----------------------------------------------------------------------------------------
--> Unplug
No log. Displays "on Battery"
-----------------------------------------------------------------------------------------
--> Plug in

Aug 05 16:22:35 fedora systemd[1]: Started
dbus-:1.10-org.kde.powerdevil.backlighthelper@9.service.
Aug 05 16:22:35 fedora audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295
ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.10-org.kde.powerdevil.backlighthelper@9 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Aug 05 16:22:36 fedora kernel: ucsi_acpi USBC000:00: UCSI_GET_PDOS failed (-95)
Aug 05 16:22:45 fedora systemd[1]:
dbus-:1.10-org.kde.powerdevil.backlighthelper@9.service: Deactivated
successfully.
Aug 05 16:22:45 fedora audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295
ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.10-org.kde.powerdevil.backlighthelper@9 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'

Displays "AC power connected"
-----------------------------------------------------------------------------------------
--> Unplug

Aug 05 16:24:30 fedora kernel: ucsi_acpi USBC000:00: UCSI_GET_PDOS failed (-95)

Displays "AC power connected"

--> AFTER A MINUTE

Aug 05 16:25:07 fedora kwin_x11[3102]: qt.qpa.xcb: QXcbConnection: XCB error: 3
(BadWindow), sequence: 65032, resource id: 85983243, major code: 18
(ChangeProperty), minor code: 0
Aug 05 16:25:51 fedora systemd[1]: Started
dbus-:1.10-org.kde.powerdevil.backlighthelper@12.service.
Aug 05 16:25:51 fedora audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295
ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.10-org.kde.powerdevil.backlighthelper@12 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Aug 05 16:26:00 fedora systemd[1]:
dbus-:1.10-org.kde.powerdevil.backlighthelper@12.service: Deactivated
successfully.
Aug 05 16:26:00 fedora audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295
ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.10-org.kde.powerdevil.backlighthelper@12 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Aug 05 16:26:06 fedora systemd[1]: Started
dbus-:1.10-org.kde.powerdevil.backlighthelper@13.service.
Aug 05 16:26:06 fedora audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295
ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.10-org.kde.powerdevil.backlighthelper@13 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Aug 05 16:26:15 fedora systemd[1]:
dbus-:1.10-org.kde.powerdevil.backlighthelper@13.service: Deactivated
successfully.
Aug 05 16:26:15 fedora audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295
ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.10-org.kde.powerdevil.backlighthelper@13 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Aug 05 16:26:21 fedora systemd[1]: Started
dbus-:1.10-org.kde.powerdevil.backlighthelper@14.service.
Aug 05 16:26:21 fedora audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295
ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.10-org.kde.powerdevil.backlighthelper@14 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Aug 05 16:26:30 fedora systemd[1]:
dbus-:1.10-org.kde.powerdevil.backlighthelper@14.service: Deactivated
successfully.
Aug 05 16:26:30 fedora audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295
ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.10-org.kde.powerdevil.backlighthelper@14 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Aug 05 16:26:38 fedora systemd[1]: Started
dbus-:1.10-org.kde.powerdevil.backlighthelper@15.service.
Aug 05 16:26:38 fedora audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295
ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.10-org.kde.powerdevil.backlighthelper@15 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'

Aug 05 16:26:48 fedora systemd[1]:
dbus-:1.10-org.kde.powerdevil.backlighthelper@15.service: Deactivated
successfully.
Aug 05 16:26:48 fedora audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295
ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=dbus-:1.10-org.kde.powerdevil.backlighthelper@15 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'

---> Displays "On Battery"
```

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