Linux backlight on Intel laptops

viernes, enero 06, 2017 , 0 Comments

 

Errors:

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

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

Solutions:

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

acpi_osi=
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"
EndSection
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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