Ubuntu: Ubuntu 15.04 brightness doesn't work



Question:

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!!!


Solution:1

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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