Brightness key not working Ubuntu 16.04 LTS

Question

I've just installed Ubuntu 16.04 on my Lenovo Z400 notebook and everything was working. Today I tried to change the brightness of the screen and it gets dark and I can't go back. Can anyone help me?

Thanks

related https://askubuntu.com/questions/468277/screen-brightness-isnt-taking-effect-on-a-lenovo-z570 — Ciro Santilli OurBigBook.com, Nov 15 '17 at 21:16

score 16 · Answer 1 · edited Oct 14 '16 at 20:45

16

I faced the same problem before on my laptop Lenovo z500 ideapad after searching i found this solution :

open terminal
sudo nano "/etc/default/grub"

append acpi_backlight=vendor to the GRUB_CMDLINE_LINUX_DEFAULT line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor"

save and close nano (Ctrl+X, then confirm saving changes)
sudo update-grub
restart

If nothing changes , you can check the solutions of this question.

edited Oct 14 '16 at 20:45

Byte Commander

107,489

answered May 10 '16 at 06:03

Mohamed Slama

1,849
1
17
37

This does not work for ThinkPad P50 on 17.10. – Sander Verhagen Feb 08 '18 at 10:05
this did not work. (Lenovo Ideapad). – Nayab Samar Nov 22 '21 at 10:34

Brightness key not working Ubuntu 16.04 LTS

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