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This question already has an answer here:

How to fix my problem with Acer Aspire 4736z laptop screen brightness? I am using Ubuntu 16.04 LTS.

marked as duplicate by Ron, Zanna, Community Nov 7 '16 at 14:25

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  • how can I change the grub cmdline linux? – Dumb Question Nov 7 '16 at 14:00
  • There is nothing appearing when I typed sudo update-grub – Dumb Question Nov 7 '16 at 14:09
  • You don't need to do anything with grub. Why are you not reading Venkat's answer? He didn't suggest editing grub. – Ron Nov 7 '16 at 14:13
  • I do not have this bash: /usr/share/X11/xorg.conf.d/20-intel.conf: No such file or directory – Dumb Question Nov 7 '16 at 14:19
  • create it by sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf – Ron Nov 7 '16 at 15:45