My laptop has ramdom reboot problem. (I use Arch Linux)
My laptop dosen't have keyboard backlight, but powerdevil seemed to activate it which appeared in

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journalctl -b -1

I want to disable keyboard backlight control in KDE Plasma, what should I do?
Thank you.
Log Information：

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journalctl -b -1 | grep powerdevil | grep backlight

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Jun 05 23:39:29 aperture-sci-arch org_kde_powerdevil[827]: powerdevil: No outputs have backlight property
Jun 05 23:39:29 aperture-sci-arch dbus-daemon[544]: [system] Activating service name='org.kde.powerdevil.backlighthelper' requested by ':1.26' (uid=1000 pid=827 comm="/usr/lib/org_kde_powerdevil ") (using servicehelper)
Jun 05 23:39:29 aperture-sci-arch dbus-daemon[544]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'
Jun 05 23:46:26 aperture-sci-arch org_kde_powerdevil[827]: powerdevil: Kbd backlight brightness value:  0
Jun 05 23:46:26 aperture-sci-arch dbus-daemon[544]: [system] Activating service name='org.kde.powerdevil.backlighthelper' requested by ':1.26' (uid=1000 pid=827 comm="/usr/lib/org_kde_powerdevil ") (using servicehelper)
Jun 05 23:46:26 aperture-sci-arch dbus-daemon[544]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'
Jun 05 23:46:26 aperture-sci-arch org_kde_powerdevil[827]: powerdevil: Udev device changed "/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight" "/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight"
Jun 05 23:47:41 aperture-sci-arch dbus-daemon[544]: [system] Activating service name='org.kde.powerdevil.backlighthelper' requested by ':1.26' (uid=1000 pid=827 comm="/usr/lib/org_kde_powerdevil ") (using servicehelper)
Jun 05 23:47:41 aperture-sci-arch dbus-daemon[544]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'
Jun 05 23:47:41 aperture-sci-arch org_kde_powerdevil[827]: powerdevil: Udev device changed "/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight" "/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight"
Jun 05 23:48:56 aperture-sci-arch dbus-daemon[544]: [system] Activating service name='org.kde.powerdevil.backlighthelper' requested by ':1.26' (uid=1000 pid=827 comm="/usr/lib/org_kde_powerdevil ") (using servicehelper)
Jun 05 23:48:56 aperture-sci-arch dbus-daemon[544]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'
Jun 05 23:48:56 aperture-sci-arch org_kde_powerdevil[827]: powerdevil: Udev device changed "/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight" "/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight"
Jun 05 23:49:02 aperture-sci-arch org_kde_powerdevil[827]: powerdevil: Udev device changed "/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight" "/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-eDP-1/intel_backlight"


journalctl -b -1 | grep powerdevil
https://pastebin.com/ymvxK5za

journalctl -b -1
https://pastebin.com/qNWFt0ni

Same problem here. The issue seems to be there is no code to process when backlighthelper fails to find a backlight interface. It just ignores it and continues to activate the service.

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# journalctl -b -1 | grep powerdevil | grep backlight
Jun 28 11:03:05 archmain org_kde_powerdevil[2666]: powerdevil: No outputs have backlight property
Jun 28 11:03:05 archmain dbus-daemon[440]: [system] Activating service name='org.kde.powerdevil.backlighthelper' requested by ':1.48' (uid=1000 pid=2666 comm="/usr/lib/org_kde_powerdevil ") (using servicehelper)
Jun 28 11:03:05 archmain backlighthelper[2775]: powerdevil: no kernel backlight interface found
Jun 28 11:03:05 archmain dbus-daemon[440]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'

Then, the service fails when it can't find it:

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Jun 28 11:22:47 archmain org_kde_powerdevil[799]: powerdevil: org.kde.powerdevil.backlighthelper.brightness failed
Jun 28 11:22:47 archmain org_kde_powerdevil[799]: powerdevil: ""