Brightness Problem lenovo Z500

Asked by Himanshu Gupta on 2019-02-05

Hello All,
I am using Lenovo z500 Laptop. Recently i have switched from Windows to Ubuntu 18. But my brightness is going to nill. Function keys are also not working and i have put it on 100% , then to it was at its low. Their is no support fron lenovo site on ubuntu. So, Please anyone help me to fix this. Other wise i have to switch from ubuntu to windows agian

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Solved by:
Himanshu Gupta
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Adding the idle threat of switching back to windows doesn’t make anyone want to help you any more or any less.

There is no Ubuntu 18. There is Ubuntu 18.04 and Ubuntu 18.10.

What is the output of:

lsb_release -a; uname -a


Himanshu Gupta (himz) said : #3

Here is the output for lsb_release

No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.1 LTS
Release: 18.04
Codename: bionic
Linux himz-Lenovo-IdeaPad-Z500 4.15.0-42-generic #45-Ubuntu SMP Thu Nov 15 19:32:57 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

The n it's Ubuntu 18.04, not Ubuntu 18


sudo gedit /etc/default/grub

then look for

Change this to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=video"

Save the new file, close gedit and run:
sudo update-grub

Reboot to test


Himanshu Gupta (himz) said : #6

i am not able to update the grub file. Can you please help me in that .

What is the output of the:

sudo update-grub

command, please?


Himanshu Gupta (himz) said : #8

Thanks man , Its working. Thanks for your help , i really appreciate it.

All I did was a cursory search. Came up immediately. One of the first links.

All I did was a cursory search. Came up immediately. One of the first links.

Himanshu Gupta (himz) said : #11

i tried that earlier with vi editor and i am not able to edit the grub file in vi. I have tried to override it to but not able to do that. But thanks now it works.