I am not able to change brightness on Ubuntu 17.10. Keywords function are also not functioning. There is no option of brightness control system on a Ubuntu 17.10. How to change brightness??
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[this](https://askubuntu.com/questions/966557/how-do-we-turn-down-the-insane-brightness-on-ubuntu-17-10) might be worth a look – Robert Riedl Feb 03 '18 at 21:16
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Are you using Wayland or Xorg as display server? – David Foerster Feb 21 '18 at 11:29