Reactivating the Backlight
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Some people - particularly those using laptops - are encountering a problem where the screen brightness is too dim upon replacing Microsoft Windows with a Linux distribution as their main operating system. Although it affects all Linux distributions, the problem is actually due to the computer's BIOS settings. Certain hardware manufacturers have set it up so that if Windows is not detected running on their systems, the backlight is automatically disabled.
Reactivating the Screen Backlight
This problem can be easily fixed by ensuring that the GRUB bootloader re-activates the backlight. To do this, first open up your terminal, and enter the following command:
sudo sed "s/\(GRUB_CMDLINE_LINUX=\)\"\"/\1\"acpi_osi=Linux acpi_backlight=vendor\"/" /etc/default/grub -i
You will also have to enter your password to continue. Now enter the second and final command:
Problems with brightness keys are most often vendor and bios dependent.
sudo gedit /etc/default/grub
Add the following parameters to grub configuration:
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