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I read a lot on my computer especially at night. Can I somehow set the screen brightness level on my laptop even lower than the Brightness menu does?

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You can increase gamma once you achieved maximum brightness level. Or use high contrast screen colors for better readiblity.

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You can try with xrandr, use it like this:

xrandr --output LVDS1 --brightness 0.8

You can set gamma through xrandr too:

xrandr --output LVDS1 --gamma 0.9:0.9:0.9 --brightness 0.8

To get the output name (in this example LVDS1) use:

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