In Xubuntu 22.04's Power Manager's panel icon's GUI, I could reduce my screen's brightness until it was entirely black. In Xubuntu 24.04, the lowest setting in the GUI is much higher than "entirely black". I have read through the change log for Xfce 4.18 and 4.16, but I cannot find any reference to this. What software changed in order to change this behaviour between Xubuntu 22.04 and 24.04?
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