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brightness on my Lenovo-IdeaPad-P400-touch graphic Intel® Ivybridge Mobile os type 64-bit Ubuntu 15.04 doesn't increase or decrease after updating from 14.04 please help!!!

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  • 1
    what does ls /sys/class/backlight show?
    – Ron
    May 7, 2015 at 5:33
  • hey it show ideapad intel_backlight and thanks for the replay!!
    – azizo1
    May 11, 2015 at 22:13
  • I have the same problem ):
    – FeanDoe
    May 15, 2015 at 17:42

1 Answer 1

Reset to default
0

Create this file:

gedit /usr/share/X11/xorg.conf.d/80-backlight.conf

and put the below contents into it and save it.

Section "Device"
    Identifier  "Intel Graphics"
    Driver      "intel"
    Option      "AccelMethod"     "sna"
    Option      "Backlight"       "intel_backlight" # use your backlight that works here
    BusID       "PCI:0:2:0"
EndSection

Reboot and see if this solves your problem.

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1
  • still the same nothing change!!!
    – azizo1
    May 12, 2015 at 23:40

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