Manually adjusting brightness no longer workers after 8/5/20 Windows update?

  • For a while now, I've used f.lux's keyboard shortcut of alt+pagedown to reduce my monitor's brightness at night (on top of the usual color settings). However, after the most recent windows update yesterday, this functionality no longer works - I get the f.lux popup of:

    dimming until sunrise
    Circadian response: 0% (Circadian darkness)

    but unlike before, my monitors don't reduce in brightness at all.

    Is there a way to fix this?

  • uninstalling and re-installing f.lux worked

  • The problem comes back for me when I restart the computer

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