I'm not sure if this is the right community to ask about this, so if there's somewhere else I should be, let me know please.
Until today, my brightness could be toggled using the action center (the 0%, 25%, 50%, etc.) However, today when I press the button, no action is conducted. I can change the brightness via other methods, but not through the action center. I tried restarting explorer, but it didn't work. Is there a fix?