I am facing issue with the brightness, when I set to low then I was rebooting it was not saved on the state that I set.
Just open up your terminal and edit /etc/default/grub
then on the line GRUB_CMDLINE_LINUX=" " you have to add this acpi_backlight=native
and the final state if in your case this does not seem to be work you can also add acpi_backlight=native
in the end of GRUB_CMDLINE_LINUX_DEFAULT=" acpi_backlight=native" keep that in mind put acpi_backlight=native before quote "
Finally you can update-grub with sudo
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