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Brightness is not varying. The screen is seemed to be in maximum brightness. Help me somebody please.

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1.Open file sudo gedit /etc/default/grub

2.There will be something like: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash".

Change it to

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

3.Save file

4.Run command

sudo update-grub

5.Reboot

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