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Friday, August 10, 2012

[Solved] Brightness Increase and Decrease Problem in Ubuntu-using grub Update

in Acer Aspire , brightness , change , decrease , Dell Inspiron , grub , HP DV6 , increase , kernel , problem , Ubuntu , Ubuntu 12.04 , Ubuntu 12.10 , Ubuntu 12.10 Quantal Quetzal , Update
Brightness problem in Ubuntu is one of the major problem in many PCs and I have the same problem in my laptop Acer Aspire 3830 TG in Ubuntu 12.10 Quantal Quetzal. When I use the function key and brightness button the indicator of brightness changes but there will be no change of brightness.
I searched in the web and found the many solutions but not working exactly for the problem. Before in my blog post I had given the solution for the brightness problem but I only changes the contrast. The battery power consumption is same if the display is more or less.

I have tried by updating the Kernel to the latest version. But I have found the best solution that can increase or decrease the brightness of the PC in Ubuntu using the function and brightness button. Just follow the steps:

Open terminal (Clt+Alt+T)  and run the command given below:
sudo gedit /etc/default/grub
Now the new window opens and you will see the lines given below:
Now you have to change the lines above by the command lines given below:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"
Then save the window and Update the grub from the terminal using :
sudo update-grub
Now you can Increase or decrease the brightness of your PC in Ubuntu 12.04 and the other versions also. This technique can be used in HP DV6, Acer Aspire, Dell Inspiron,  Toshiba and more others.

                        Hope this Helps!


It does not work in DV6 on linux mint12.. any other suggestions?

I was good and worked properly in DV6 and the solution given above solved for me in Ubuntu. Its same for the Mint also..Try once properly...

it worked for me..i am using hp pavillion dv6..thanx..:)

this doesn't work on a Toshiba Satellite.
I've tryied Fedora and DEbian, then Ubuntu, and thousands different ways to fix it but the brightness still remain high..
wtf is wrong with linux??

Thank you very much.
It works for my laptop Gateway NV57H.

I tried it on my hp pavillion dv6 with 12.10 ubuntu but does not work, do you have any other clues?

worked for me on a dell studio 1558 running Ubuntu 12.10, thank you! I thought my eyes were gonna melt out of their sockets for a couple days.

It works in my HP Envy 14 but now the keyboard controls doesnt work any more, any clues??

it worked in my hp dv6 ,, my eyes love u man

It worked on my Acer Aspire V5 laptop. Thank you so much!

Works at Asus UL20A. Thank you!

works for Dell XPS laptops but the lowest brightness level is '0' that is the screen shuts off.

Totally works for Gateway NV5103h. Thanks a lot!!

not working in Dell Inspiron N4010 so you give me solution, and i hope you got it.


It should work in Inspiron N4010 if you have done properly.. Try once ..

Worked on Acer 3830T with ubuntu 12.10
Thank you

Works! Acer s3 Ubu 12.10 x64

Acer V3-571G, intel hd4000, nvidia turned off. Ubuntu 13.04. Don't work. On all previous version all was fine.

works lenovo Z360...I love you!!

Does not work, on Asus Zenbook UX52VS-CN021H

it works on samsung N102 SP with Ubuntu 12.04...thank you for the guides

Is there any way to get it so I can adjust brightness in game? I'm using Lubuntu 12.10 on an HP zv6000 and am unable to adjust the brightness in ANY games. I'm using the open source Radeon driver with Mobility Radeon Xpress 200M. I really don't want to have to go back to Windows. Thanks.

It didn't work! I did exactly as you showed it here, and my brightness is still just as insanely bright.

It didn't work in Toshiba L 830-10U.

It did not work in Toshiba M840

THANKS A LOT!!.. my battery is much better. This work for me on HP Envy 14 with AMD discrete VGA card, but i power off the discrete and use only integrated because the switch is very complicated.

Thanks again... Greetings.

"Command not found" on my Samsung Laptop

I was playing around and noticed that my Ubuntu 12.04 changed a driver (probably my fault) to "ATI fire GL" i reverted it back to "ATI/AMD proprietary FGLRX graphics driver." It fixed my problem with changing brightness. I hope this gets to others and also that it help.

This sets backlight to lowest brightness and there is no way to increase it.

Acer aspire v3-571G
works perfect! but needed to reboot computer, after updating grub

Thank you!!!

totally works on Acer D270. Just tried it after 3 hours of searching. I wish someone could solve the multi-monitor issue as well. I am a total NOOB at Linux and I'm trying to get hooked.

Works perfect on Asus P81IJ, thank you much!

You win the day! Gateway NV55c29u fixed!

Gracias... tenia desde la version 12.04 con este problema en todas las HPdv... ufff es un alivio....

please i need help after lose my eyes, i'll try it but don't work on dell inspiron n4010 ubuntu 13.04, that's on the highest bright please help...

Solved backlight adjust issue in my Acer Aspire V3-571 after reboot.
Thanks a million :)

Aristo vision i375 fixed :D

Working on Samsung N350 with Ubuntu 12.10! (After reeboot).
I have been looking for a solution on this issue for a long, long time. Thanks!

working on dell inspiron 15 with ubuntu 13.04 :) thx!!

Worked for me! Ubuntu 12.10 with an Acer v5-171 netbook!


confirmed.. it works perfectly on lenovo Z360

Worked perfect on a HP Envy m4-1115dx with Ubuntu 12.04

On Dell inspiron 1370 Bt5r3, i did ....

1. GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force acpi_backlight=vendor"
2. update-grub

sudo apt-get install xbacklight

xbacklight -set 10

where 10% can be anything btwn 0-100%

thank you.

works on a hp envy 15z. thank you

I use 3 linux operating systems on a Gateway NE46R07m, Gateway LT4002m 1.- MiniNo PicarOS Diego a magnificent Debian derivate for education of Children and Teachers-and Fathers to-(you can choose Spanish, Gallego, Catalán et English) ; and brightness do not work (It works in a DELL Inspiron M5030), 2.- Ultimate Edition 3.8 and 4.0 it Works as should be, 3.- ArtistX 1.4 and 1.5 (a Italian Design and Multimedia distro)it Works as expected; so it could be more a hardware problem, i have tested other OSs like AntiX and it works, Puppy Linux-es Spanish Argentinian edition and do not work, but in this one do not matter because is all black, except when you open a white web page, on firefox is easy to change the botom color for a optical green or another eye care color.

thank you again and again ..............................................aspire V5 171

Perfect solution for Acer Aspire v3-571. Thanks.