So I have my Dell laptop set up for a dual boot. When I am in windows the lighted keyboard works. But when I boot to Zorin 17 core it no longer works Any thoughts. I have not been able to figure it out.
It's “optional hardware” so the system isn't configured to support it out of the box. I can't help about this specific issue but mates here would probably ask your computer model 
. You're surely going to need an extension or something to make keyboard LEDs to work as with Windows.
Z17 is based on Ubuntu 22.04, so a websearch of "Dell laptop keyboard backlight Ubuntu 22.04" may reveal answers.
I have found these items, which may help:
Dell Latitude 7490
I have tried the steps in the first article and I get the following.
brightnessctl --device='tpacpi::kbd_backlight' info
Device 'tpacpi::kbd_backlight' not found.
Both articles are the same. so I am not sure how to move forward. Any other advise would be nice'
Did it work with Zorin 16.x?
Saw something about a BIOS update for use with Linux / Ubuntu on Dell's site:
https://www.dell.com/support/kbdoc/en-us/000131486/update-the-dell-bios-in-a-linux-or-ubuntu-environment#Flashing%20a%20Dell%20BIOS%20in%20a%20Linux%20Only%20Environment
Don't know if that would be helpful in your situation or not - might though. That might be a BIOS event the kernel can't handle without some help (update).
I started off with 17.1. I have a work around. I can turn the light on manually.
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following this thread...
i have a samsung lappy but it's keyboard don't work so i plugged in an external keyboard with backlight that one can switch on/off.
in windows it worked fine, then i had different distros of linux and with none of them the keyboard light works.
doesn't really bother me ,but now ima try find a solution , just to see if i can lol
oooh ok ,took me 5 min and now keyboard backlight works 
ugh cant get it to stick with saving the command in .bashrc
everytime i log out/in the backlight doesn't work again.
more challenges to make me happy lol