I have a dell Chromebook 11 3120 running Gallium OS and I can’t adjust the brightness using the brightness buttons.
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Gallium os is old
Use a newer linux distro
Plus visit WeirdTreeThings github repo
He has some keymapping stuff there
Coolstar also has it but windows only
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If you get your problem solved, kindly reply back with what you did and how is it now, this way you get to help other community members and you get more support in return.
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sure thing 
GalliumOS is dead. read the docs here, install a supported/modern distro, run any post-install scripts needed, then ask for help
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