Ubuntu – Brightness control on Samsung Ativ Book 6


I recently installed Ubuntu 14.04 on my Samsung Ativ Book 6 (NP680Z5E-X01US).

Since then I am completely unable to modify my brightness settings. The Fn buttons work fine, if I press Fn+F2/F3 I can see the brightness slider, but no change happens until I push it down to where it deactivates the screen. Also, there is no response from the keyboard backlight. Other work fine (audio, wifi, mousepad-lock)

I have tried several options and I am essentialy in the same spot of the user here:

Can't adjust brightness on my MSI VR420 laptop

What I tried:

  • Edit /etc/default/grub ↦ GRUB_CMDLINE_LINUX_DEFAULT: acpi_osi=Linux,
    acpi_backlight=vendor (as well as several different combinations of
    these settings being on or off)

  • Edit /etc/X11/xorg.conf (file doesn't exist on my system)

  • sudo setpci -s 00:02.0 F4.B=XX (does nothing)

  • xbacklight -set XX (does nothing)

  • install indicator-brightness (changing its value does nothing)

Checking the folder

ls /sys/class/backlight/intel_backlight/

shows that

max_brightness = 4882



change as I move the slider in step of 244, but no corresponding change in brightness happens.

My graphic card is

00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09)       

I also have a Radeon

01:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Mars [Radeon HD 8670A/8670M/8750M] (rev ff)

Best Answer

I managed to solve this by doing a fresh 14.04 install, the screen brightness commands now works right after the install without any trick needed. I reinstalled after upgrading to 14.10 bricked my graphic interface.

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