Why is my DPMS off despite enabling it in Xfce settings?

xset -q says DPMS is disabled for me, which isn't good, because it prevents xfce4-screensaver from disabling backlight when active. xset +dpms fixes it until reboot. But I don't understand why DPMS isn't enabled out of the box. I did enable the [DPMS toggle in Xfce power manager settings](https://docs.xfce.org/xfce/xfce4-power-manager/preferences#display) , yet xset -q shows it as disabled on boot.