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ls /sys/class/backlight/
is not giving any output on my terminal. I have Ubuntu 17.10 dual booted alongside Windows 10 on my Alienware r3 15. I need to solve this issue to try to fix my main issue Unable to change the screen brightness given in the article https://itsfoss.com/fix-brightness-ubuntu-1310/. Kindly help me find a solution.

  • what video card do you have? do you have the drivers installed for it? – Joshua Besneatte May 13 '18 at 20:53
  • I have an 'Intel(R) HD Graphics 630' and an 'Nvidia GeForce GTX 1060' on my system. lspci |grep -i vga only showed the Nvidia card though. You may check the output of sudo lshw -C display in my another question [askubuntu.com/questions/1028979/…. I am not sure if I have the drivers installed, at least I haven't installed them specifically. I am not sure if Ubuntu has installed it's own drivers for video cards or not @JoshuaBesneatte – Vaibhav Mishra May 14 '18 at 21:20
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That folder is empty for me too. Look for your card type with:

System Settings->Details->About

or from the command line

lspci |grep -i vga

and then you can find what driver you are using with:

lsmod

then update/create your config according to the link you posted

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