I have installed xfce4-power-manager-plugins on kicksecure ova.
Power manager from tray icon doesn’t have any brightness slide.
I assume you’re using Kicksecure in VirtualBox if you’re using the OVA? If so, VirtualBox doesn’t provide a virtual backlight device that can be configured like that. You can change the brightness of the host system’s display instead.
If you’re using the OVA image directly on physical hardware somehow, you probably shouldn’t do that. Physical hardware installs can be done using the Kicksecure ISO.
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