If the previous commands do not work, there is a chance that vbetool may work. Alternately, xset s could be used for a similar effect. The backlight should switch on again on mouse movement or keyboard input. Ideally the following command should work for any Xorg graphical session: Switching off the backlight (for example when one locks a notebook) can be useful to conserve battery energy. It also provides /usr/share/ddcutil/data/les and /usr/share/ddcutil/data/les for udev rules.
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