Afetr some updates of my system Ubuntu 16.04 LTS; the brightness is higher, I'haven't possibility to set it, It doesn't appear on power manager. I've installed xbacklight and set this configuration

xbacklight =50    
xbacklight +10    
xbacklight -10   

After the reboot, nothing change, this dialog box prompts dialog box That mean : Impossible to set the configuration So I installed Indicator brightness to have to set it in the system tray, but i have this notification:No backlights were found on your system
I do ls /sys/class/backlight/ It returns nothing I decided do to use laptop-mode-tools, but I can't use it because the precendent command return nothing ( no files or directories in /sys/class/backlight/) Maybe this can help to:

lspci | grep "VGA compatible controller"
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 0b)

I think I did more effort for my English level.

I need your helps to solve this problem. My eyes are suffering actually

This the output of lshw

 *-display NON-RÉCLAMÉ
         description: VGA compatible controller
         produit: Haswell-ULT Integrated Graphics Controller
         fabriquant: Intel Corporation
         identifiant matériel: 2
         information bus: pci@0000:00:02.0
         version: 0b
         bits: 64 bits
         horloge: 33MHz
         fonctionnalités: vga_controller bus_master cap_list
         configuration: latency=0
         ressources: mémoire:b2000000-b23fffff mémoire:a0000000-afffffff portE/S:6000(taille=64)
  • It seems like a problem with your graphic drivers. Please, post the output of lshw (here, look for *-display). – Juanjo Salvador Jul 7 '16 at 12:35
  • @hackthatos for the future, you are able to add comments to answers to your question. You do not need to post comments as answers. Look for an "add a comment" button underneath each answer, you should be able to see it. You can click that, and then add comments to answers asking for clarification of the answer or results you get from a command they said to run. – Thomas Ward Jul 7 '16 at 14:07
  • My question is when can I consider my poste like an Answer or comment. Excuse me of my ignorance, Everything is complelety different here from where I'm coming. And i'm suprised when @JuanjoSalvador said: "this is not a forum" – hackthatos Jul 7 '16 at 17:44

an alternative way to set the brightness is to use xrandr

xrandr --output $DISPALY --brightness $VALUE

$DISPLAY is the name of your connected display, you can get a list of all displays with

xrandr -q | grep "connected"

replace $VALUE with your desired level of brightness.

example : xrandr --output LVDS1 --brightness .4

  • Thank for your answer, this the output of the command: ~$ xrandr -q | grep "connected" xrandr: Failed to get size of gamma for output default default connected primary 1366x768+0+0 0mm x 0mm Please, what else ? – hackthatos Jul 7 '16 at 12:12

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