Linux backlight on Intel laptops

0:23:00 , 0 Comments

Error 1:
When Fn keys are pressed, the OSD show bright percentage, but  backlight bright doesn't change.

Error 2:
When Fn keys are pressed, the OSD do not appear.

If OSD appears while keys are pressed, just add this line to the bootloader

If not, didn't show OSD and backlight didn't change too,  please add the below text to  /usr/X11/xorg.conf:

Section "Device"
    Identifier  "Card0"
    Driver      "intel"
    Option      "Backlight"  "intel_backlight"
The first line checks if Intel Driver is properly installed in our system, the second one checks if intel's backlight as we can see in the third line:

lspci -nnk | grep -i vga -A3 | grep 'in use'
ls /sys/class/backlight/
acpi_video0  intel_backlight

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