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The Debian sid install on my Lenovo T450 allows control over the brightness via fn+F5 and fn+F6 keys.

In dark environments, the minimum brightness setting is too dim for me, however min brightness + 1, is too bright.

The file /sys/class/backlight/intel_backlight/brightness" allows me to read the current brightness setting, and using echo 16 > brightness, i can set my ideal brightness.

Min brightness = 1 Max brightness = 851

I've also found that setting brightness to zero appers to disable the backlight entirely.

Is there a way to somehow configure brightness hotkey behavior in Gnome?

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Set a custom shortcut: https://help.gnome.org/users/gnome-help/stable/keyboard-shortcuts-set.html.en

Use xbacklight:

$ xbacklight -inc 10

$ xbacklight -dec 10

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    Extra note: intel_backlight is sometimes buggy with xbacklight. I may be needed to set Option "Backlight" "intel_backlight" inside the Device section of xorg.conf – grochmal Sep 14 '16 at 0:28

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