This is hardware-specific, so there's no intention to fix it directly in
Xubuntu. I found a related forum post here with two confirmed solutions:
https://forum.xfce.org/viewtopic.php?id=17176
** Changed in: xubuntu-default-settings (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1990921
Title:
Brightness keys not working on Chromebooks
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