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I have an Alienware r3 15 laptop in which I've recently installed Ubuntu 17.10(dual boot with Windows 10). So far everything's fine except that I am unable to find any setting(if any) to change the brightness. There is no brightness slider in the system menu nor anything to change the brightness in "Settings". I tried installing the brightness changer indicator by:

sudo add-apt-repository ppa:indicator-brightness/ppa
sudo apt update
sudo apt install indicator-brightness

but it's saying that no backlights were found on my system. I tried changing the backlight from the command line:

sudo echo 100 | sudo tee /sys/class/backlight/*/brightness
tee: '/sys/class/backlight/*/brightness': No such file or directory 100

Please help. The output of sudo lshw -C display on my terminal is:

*-display 
   description: VGA compatible controller
   product: GP106M [GeForce GTX 1060 Mobile]
   vendor: NVIDIA Corporation
   physical id: 0
   bus info: pci@0000:01:00.0
   version: a1
   width: 64 bits
   clock: 33MHz
   capabilities: pm msi pciexpress vga_controller bus_master cap_list rom
   configuration: driver=nouveau latency=0
   resources: irq:125 memory:dc000000-dcffffff memory:b0000000-bfffffff memory:c0000000-c1ffffff ioport:e000(size=128) memory:c0000-dffff
*-display
   description: Display controller
   product: Intel Corporation
   vendor: Intel Corporation
   physical id: 2
   bus info: pci@0000:00:02.0
   version: 04
   width: 64 bits
   clock: 33MHz
   capabilities: pciexpress msi pm bus_master cap_list
   configuration: driver=i915 latency=0
   resources: irq:126 memory:db000000-dbffffff memory:70000000-7fffffff ioport:f000(size=64)
  • 2
    Version 17.10 isn't LTS – L.F.C. Apr 27 '18 at 21:46
  • See if this article helps: itsfoss.com/fix-brightness-ubuntu-1310 – WinEunuuchs2Unix May 12 '18 at 17:04
  • I've seen this article and it didn't help. ls /sys/class/backlight/ gives no output on my terminal and I think there is no place in the "Settings" where I can find the graphics card. @WinEunuuchs2Unix – Vaibhav Mishra May 12 '18 at 20:45
  • I also didn't try creating the file given in the article because Ubuntu has switched to wayland from xorg in Ubuntu 17.10 @WinEunuuchs2Unix – Vaibhav Mishra May 12 '18 at 20:47
  • Wayland might be part of the problem. You can switch to X11 if that is the case. – WinEunuuchs2Unix May 12 '18 at 20:51
1

you can install the brightness changer indicator:

sudo add-apt-repository ppa:indicator-brightness/ppa
sudo apt update
sudo apt install indicator-brightness

after launching it should shows on your panel. click it and choose the desired value.

Another way is to do:

echo 1000 | sudo tee /sys/class/backlight/*/brightness

change 1000 to desired value

  • i installed the brightness indicator but it's saying that no backlights were found on my system and when I tried "echo 1000 | sudo tee /sys/class/backlight/*/brightness" it showed "sudo echo 100 | sudo tee /sys/class/backlight/*/brightness tee: '/sys/class/backlight/*/brightness': No such file or directory 100" – Vaibhav Mishra May 2 '18 at 0:19
  • did the brightness work for an older version of ubuntu? – ptetteh227 May 2 '18 at 1:14
  • it didn't but i didn't try fixing it then either. – Vaibhav Mishra May 2 '18 at 20:43
  • post the output of sudo lshw -C display in the question. – ptetteh227 May 2 '18 at 23:58
  • I have added the output in the question @ptetteh227 – Vaibhav Mishra May 12 '18 at 16:01

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