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I have MBA(2016) and I fully installed Ubuntu 16.04.1 on it. I used to change brightness with my function keys. Suddenly it doesn't work now. The thing is that my keys are working, Ubuntu shows me that I dim my brightness but it doesn't change the brightness.(my backlight keys and functions are working) 

$ ls -a /sys/class/backlight
.  ..  acpi_video0  intel_backlight
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  • Please run ls -a /sys/class/backlight and add the output to your question.
    – Hölderlin
    Dec 28, 2016 at 14:26
  • @Hölderlin updated.
    – Ege Sucu
    Dec 28, 2016 at 18:56
  • Please don't use screenshots for text you can copy and paste. Instead, copy, paste into your question, select it with mouse, press {} button in the editor to format it properly.
    – Chai T. Rex
    Dec 28, 2016 at 18:59
  • @ChaiT.Rex sorry, edited.
    – Ege Sucu
    Dec 28, 2016 at 19:18
  • Could you also be add the output of lspci -nnk | grep "VGA" -A2
    – Hölderlin
    Dec 28, 2016 at 19:43

1 Answer 1

Reset to default
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Try to change the file brightness in both directories (interfaces) acpi_video0 and intel_backlight via the following command: 

sudo bash -c "echo 5 > /sys/class/backlight/xxx/brightness;"

If one of the changes affects your backlight create (if not exists) /etc/X11/xorg.conf or better /usr/share/X11/xorg.conf.d/20-intel.conf and add the following lines where "xxx" belongs to your interface:

Section "Device"
    Identifier  "Card0"
    Driver      "intel"
    Option      "Backlight"  "xxx"
EndSection

Restart your computer and see if works now. You can read also here.

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  • Applied both brightness options and it seems like the intel_backlight option solved the brightness problem. Thank you.
    – Ege Sucu
    Dec 28, 2016 at 20:00

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