Plasma 5.12.4 did not set up power settings correctly on first boot due to breakage in Powerdevil
This patch fixes it and will be part of Plasma 5.12.5 next week but distro may want to add it sooner https://cgit.kde.org/powerdevil.git/commit/?id=be91abe7fc8cc731b57bec4cf2c004c07b0fd79b Jonathan
