My os had some wifi driver problem so i upgraded to linux kenel 4.2.8 .now my brightness setting is not working.I checked How do I change my display brightness? but no luck my icon is missing. screenshot

  • Why did you upgrade?
    – Suici Doga
    Feb 7, 2016 at 12:02
  • my wifi was not working.
    – Equinox
    Feb 7, 2016 at 12:07
  • Does it work now. Also what model is your laptop. I had no problems on 4.1 with Intel HD 3000 so can you try that version
    – Suici Doga
    Feb 7, 2016 at 12:52
  • any solve? It happens to me the same in my system, and i cant set my screen brigthteness and the button behavior. Thanks!
    – user4835
    Apr 22, 2016 at 11:42
  • Nope I have new hardware parts which are only supported after kernel 4.3 and ubuntu comes with latest kernel, so I switched to ubuntu, except the brightness elementary have other problems like screen flickering in some kernel versions. I will be waiting for new elementary os Loki which is based on ubuntu 16.04
    – Equinox
    Apr 23, 2016 at 15:48

1 Answer 1


There are two solutions that come to my mind:

First one is to use the old kernel. On boot you need to open Grub >> Advanced options. There you can find the older versions.

Second solution is using "xbacklight". It's a command line tool to change the display brightness. For installation:

sudo apt-get install xbacklight

An example to change the brightness to 15 percent:

xbacklight -set 15

That are only workarounds and don't solve the the problem completely.

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