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Shortcuts for display gamma/brightness adjustment?

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Lubuntu 22.04.2 on an old Atom N550 netbook; I can control the display backlight via the settings menu and the hardware buttons, but I need it even dimmer, so I use the lower slider (labeled brightness) in the settings menu, which is, as I understand it, only a software function to adjust gamma. How can one control this using keyboard shortcuts? I tried "lxqt-config-brightness" and "pkexec lxqt-backlight_backend" in the terminal but both only adjust the backlight. Ideally I'd like to have a shortcut do decrease the gamma-brightness and one to reset it to default (off).

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