as we know chromebooks have special keyboard with some keys missing or being different
i thought i might go over a process of modifying the keyboard to make it function "properly" (it's up to preference)
the easiest way to modify specyfic key on a keyboard is using keyd
we can install it on our system with following commands
git clone https://github.com/rvaiya/keyd
cd keyd
make && sudo make install
sudo systemctl enable keyd && sudo systemctl start keyd
after that modifying keys is as easy as editing /etc/keyd/default.conf and running sudo keyd reload
currently on my machine (lenovo IdeaPad duet 5) i use this config
[ids]
*
[main]
#the format is
#key to replace = new key
#since keyboard on newer chromebooks replace f1-f12 keys with special keys this brings the keys the state i need them to be
#zoom back to f3
zoom = f3
#back back to f1
back = f1
#this makes the lock button act as delete key
sleep = delete
#different chromebooks might call that button different way so use command below to be sure
in order to check the name of button on a keyboard you can use sudo keyd monitor command
to make it easier on ppl wandering here are names for special keys on older chromebooks u can set f1-f12 key to act the way it's shown on physical keyboard
volumeupvolumedownmutebrightnessupbrightnessdowni think the names are self-explanatory
for more info on this program pls visit https://github.com/rvaiya/keyd
this i an universal way but not the only one
when it comes to gnome, inside settings -> keyboard -> show and customize shortcuts you can bind specific button to specific shortcut the brightness manipulation is missing from settings but you can set it with this commands
gsettings set org.gnome.settings-daemon.plugins.media-keys screen-brightness-down "['F6']"
gsettings set org.gnome.settings-daemon.plugins.media-keys screen-brightness-up "['F7']"
Note. this is only for old chromebooks, modern chromebooks already work without this set