Fix Unable To Change The Brightness Level On Kali Linux

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Have You Ever Have This Problem, When You Try To Change The Brightness Level In Kali Linux, Well, Here I'll Explain How To Fix It

If Your laptop back-light manufacture is Intel edit the following file to change brightness.

sudo vim /sys/class/backlight/intel_backlight/brightness

1. Check If Your laptop's back-light is detected or not by The OS kernel. And Remember, The Folder /sys/class/backlight Should Not Be Empty.

If It Is Empty, That Means Your laptop's back-light is not detected by The OS kernel. To Fix This Add This 2 Option video.use_native_backlight=1 acpi_backlight=vendor In grub command line Before The System Boot Up, Press e To Change The grub command line Before Your System boot And Add The Above Option After quiet splash . After edit last part of your grub command line shall look like

quiet splash video.use_native_backlight=1 acpi_backlight=vendor

Then boot the system. You shall find some content under sys/class/backlight/ folder now. Now edit /sys/class/backlight/intel_backlight/brightness to change brightness. You may also try one grub option at a time.

If this solves the problem update grub options and regenerate grub configuration to make the change permanent. Once the backlight is detected by Operating system the slider option shall reappear (Maybe, I'm Not 100% Sure)
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