I work on a Dell Inspiron laptop. The backlight is not working on Ubuntu. Is there any known issues like this with Ubuntu on Dell machines?
I've tried some solutions such as changing grub like the following sample but still it's not working.
sudo gedit /etc/default/grub GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor" sudo update-grub
Also, I installed xbacklight, but I can only set a value for it once and then I have to restart if I want to decrease the backlight.
Can someone tell me how can I fix it, or what else I can try?