I was in Windows 8.1 and this function works normally, but i upgrade to Windows 10 and doesn't work anymore. I try Keyboard Fn, Mobility Center and bios Function don't exist in my model for change this (I use latest BIOS version for my model).What I do in this case ?
Hi REGINADO BRAGA DE SOUZA,
Try downgrade the BIOS and check and then update the BIOS - http://dell.to/1OGE9EY and reinstall the chipset drivers from the same site.
Restart and press f2 key on startup to enter BIOS - check if the backlit works in BIOS environment.
Restart the system and press f12 key on startup - choose diagnostics. Let it run the diags and if you encounter any errors - make a note of the complete error and report the same to us.
If the system is under warranty, write me a private conversation with the service tag and your contact details.
Keep us updated.
Thanks and Regards,DELL-RishiSocial Media and Communities Professional#IWork4DellDell Support Videos Drivers and Downloads