Fix Brightness Control Not Working for Ubuntu 14.04 & Linux Mint 17

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Two of the most prominent issue with Ubuntu 13.10 are brightness control and sound. We saw how to fix no sound issue in an older post. In this quick post, we’ll see how to fix brightness function key not working in Ubuntu 14.04.

This article was originally written for Ubuntu 13.10 but it is equally able to fix brightness issue in Ubuntu 14.04 as well as Linux Mint 17.

On my Dell Inspiron, using the function key to change the brightness did not yield any results. Brightness was at the maximum and my attempts to lower it went in vain.

It turns out, there are two bugs related to brightness issue in Ubuntu. One relates to Nvidia graphics card and other relates to Intel graphics card. The solution, that worked for me, is for Intel one. Let’s first find out what graphics/video card to do you have.

Find video/graphics card in Ubuntu and Linux Mint

Run the command below in terminal to know what video card is used for the backlight/brightness:

ls /sys/class/backlight/

find graphics driver in Ubuntu

As you can see, the output for me is dell_backlight and intel_backlight. An indicator that the graphics card in use is Intel. Another way to find out the graphics card would be to go in System Settings->Details->Graphics. You can see the graphic card in use.

If your graphics card is Intel, you can proceed with the fix below.

Fix brightness control issue with Intel card in Ubuntu 14.04 and Linux Mint 17:

Open a terminal and create the following configuration file, if it does not exist:

sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf

Now we need to edit this file. You can use any editor be it a terminal one or graphical.

sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf

Add the following lines to this file:

Section "Device"
        Identifier  "card0"
        Driver      "intel"
        Option      "Backlight"  "intel_backlight"
        BusID       "PCI:0:2:0"EndSection

Save it. Log out and log in back. The brightness control should be working through function keys now:

Fix brightness control not working in Ubuntu 13.10

That’s it. I think it’s one of the must to do thing after installing Ubuntu 14.04. If it worked for you, you may also try some other small tweaks related to Ubuntu 14.04:

Did it work for you? Let me know if you have questions or suggestions.

  • Pingback: How To Fix: No Sound In Ubuntu 13.04 and Ubuntu 13.10 [Updated]

  • steven

    Thanks for your tutorial Abhishek, it is work for login and logout, but it doesn’t work if you shutdown your computer and login to the system again. Can you give me more option how to make the brightness work permanently ? Thanks.

    • http://itsfoss.com/ Abhishek Prakash

      Hmm…
      Thanks for update. In fact I did not check after shutting down. I’ll try again once I go back home and will update the tutorial with a ‘permanent’ solution.

      • sick6oy

        Have you found a solution to brightness work permanently ?

    • http://itsfoss.com/ Abhishek Prakash

      Working for me even after reboot.

    • sick6oy

      I have this problem too. After reboot I have to again adjust the brightness level.

  • steven

    hmmm, it is strange… maybe the option like

    Identifier “card0″
    Driver “intel”
    Option “Backlight” “intel_backlight”
    BusID “PCI:0:2:0″

    have different configuration between us. Can you give me clue how to get that value, so I can adjust in my system. I am using elementary Luna 0.2 FYI. Thanks in advance.

    • http://itsfoss.com/ Abhishek Prakash

      What’s the output of this command:

      ls /sys/class/backlight/

  • Reza

    Amazing! It worked for me perfectly on Thinkpad Edge 15 even after reboot. Thanks Abhishek.

    • http://itsfoss.com/ Abhishek Prakash

      Welcome :)

  • Jbal Tero

    AMAZING! It WORKED for me after so many research!. Sony VAIO VPCEG2AEN.

    • http://itsfoss.com/ Abhishek Prakash

      Glad that it works for you :)

  • Ashok

    hi,
    i am using Linux mint 16, and is there a possiblity of reducing brightness beyond the function keys can key can provide?
    even in full dim, its too bright for my eyes. Help me out..

    • http://itsfoss.com/ Abhishek Prakash

      I think yes, you can change the configuration to tweak the brightness level. I’ll find out once I get back to my home computer.

      • parkcity

        can you please tell me which file to change for additional dimming

  • vikash singh

    ty ty worked very well

    • http://itsfoss.com/ Abhishek Prakash

      welcome Vikash :)

  • Henrique Campos

    It worked on sony vaio svt1411bpxs. Thanks!!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome

  • Deepak

    Thanks it worked for ubuntu 14.04 upgrade from 12.04

    • http://itsfoss.com/ Abhishek Prakash

      You are welcome Deepak.

  • Somasundaram Mahesh

    That’s awesome fixed brightness issue on my laptop after years…!

  • Ikhsan Agustian

    works on my 14.04 fresh install

    thanks!

  • Pingback: Memperbaiki Pengaturan Brightness Laptop di Ubuntu 13.10 & 14.04 | POSS UPI

  • ExitEden

    Worked for me in 14.04 on a Lenovo V570. Thanks for posting this!

  • Kevin

    Not working for me :(
    After doing all of that, when I reboot my system I have a beautiful black screen. It’s like my screen wasn’t even turned on… strange.

    My graphic card is an hybrid intel + ATI mobility radeon 5470 (tricky card, this one). Any ideas?

    • Kevin

      I forgot saying, I’m in Ubuntu 14.04

    • http://mgelbana.blogspot.com/ Muhamma Gelbana

      The same happened to me. To fix this, you have to boot to recovery mode. Which is, when the grub menu appears, don’t choose to boot to ubuntu, there is an another entry that should look something like “Advanced options” or “recover mode”, choose that, then a menu will appear, choose to login as root. Now you have root access to your system but all your disk is mounted in read-only mode. To remount it in a writable state, type the following command “mount -o remount,rw /” then delete the file you created, restart you system, search for another solution and when you find one, please do tell :)

  • dtelaroli

    Work fine in Dell Vostro 3560.
    Thanks.

  • Curtis

    Thank You, so much. My computer was to light and couldn’t see display well. This fixed it.

  • Bharath

    Thanks a lot! The brightness control works now on my Dell Inspiron 15 (3537) with Ubuntu 14.04 on it.

  • Hiro

    Does not work for me. Using Kubuntu 14.04 on a HP Pavilion 14″

    I’ve added acpi_osi=Linux to Grub, and fn keys work for volume, but it’s always pressed, it doesnot release :/

  • christer247

    This is great if you have intel. But I’m having the EXACT same problem with Nvidia Quadro!!! :( Can someone please tell me how to fix it so the FN brightness keys actually changes the brightness? It was only AFTER installing the proprietary Nvidia driver that this problem occured, before with the Nouveau driver I could change brightness without problems.. Also there’s an ugly Nvidia logo screen popping up for about one second during boot right before the login-screen. Can someone help, or point me in any direction please? :)

    • hbhh

      nvidia-331 and prime

    • http://itsfoss.com/ Abhishek Prakash

      I have no experience with Nvidia. Perhaps some other readers have a trick.

  • Darter

    Dosn’t work for me :(

    user@Darter:~$ ls /sys/class/backlight/
    acpi_video0 intel_backlight

  • http://awsmcode.wordpress.com Vinay Kumar

    I get this error when I try to create a configuration file

    “touch: cannot touch ‘/usr/share/X11/xorg.conf.d/20-intel.conf’: Permission denied”

    I couldn’t also create a file using gedit in that particular folder as it shows “Permission denied” when I try to save.

    Please help.

    • http://itsfoss.com/ Abhishek Prakash

      Try the same command with sudo before it:
      sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf

  • Black_Cat_PL

    On Dell 14z (N411z) dosn’t work too…

    for command: ls /sys/class/backlight/ —–> I get this answer:
    acpi_video0 intel_backlight

    How to fix this bug? Some body please help…

    • Dario Jimenez

      i have the same problema, have you fix that?

    • rpgmaker

      Same here, have any of you found a fix to this problem? This was working fine up until 13.04. I don’t know what they messed up after that that screwed up this.

  • Marco Gonçalves

    Perfectly, thanks

    • http://itsfoss.com/ Abhishek Prakash

      welcome :)

  • sumit

    worked like a charm!!
    i upgraded to ubuntu 14.04 yesterday and was not quite sure what the problem was. Can you please explain a bit more on why this happens though?

  • http://mgelbana.blogspot.com/ Muhamma Gelbana

    This broke my system but I managed to recover. How can I confirm that my APU (Intel graphics integrated to the processor) is actuall card0 and not something else ?

    • http://itsfoss.com/ Abhishek Prakash

      Thanks for the recovery steps Muhamma. It will surely be useful for other readers.

    • Amar Prabhu

      It broke my system Xubuntu 14 as well.

      acpi_video0 intel_backlight

      I did the same things as you did, came back to report – and same comment.

    • Amar Prabhu

      Found the solution. Update your Grub file in /etc/default/grub to

      GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi_backlight=vendor”

      update grub using the command

      update-grub

      Reboot and you are done.

    • Kai

      “…type the following command “mount -o remount,rw /” then delete the file you created”
      How do I delete the file?

      • http://mgelbana.blogspot.com/ Muhamma Gelbana

        rm /usr/share/X11/xorg.conf.d/20-intel.conf
        [or]
        cd /usr/share/X11/xorg.conf.d
        rm 20-intel.conf

        • Felipe

          In my case none of the options deleted the file, when i tried with the first you put, the systems says “it can be deleted system of archives of only lecture” and the 2d option says that doesnt exist the archive or directory plz Help : /

          • http://mgelbana.blogspot.com/ Muhamma Gelbana

            Have you ran this command first ?
            mount -o remount,rw /

          • Felipe

            Yes I started with that command but got the results indicated. : /

          • http://mgelbana.blogspot.com/ Muhamma Gelbana

            Try browsing to the directory so you only need to specify the filename and not the full path. I don’t know how else can this be solved :/

          • Felipe

            Muhamma, finnally the problem was solved, I still cant use the brightness control but my laptop resurrected, it seems my problem was an error in tipying one of the commands line : /

          • http://mgelbana.blogspot.com/ Muhamma Gelbana

            I’m very glad it worked !
            I hope Linux will have better graphics support in the future. I love Linux and I hate to go back to windows again.

    • Thanos Tsikerdekis

      You saved me! Thank you!

  • Pingback: 10 Or 20 Things To Do After Installing Ubuntu 14.04 Trusty Tahr [Greg Laden's Blog] | Gaia Gazette

  • Raj

    Thanks, this worked perfectly! I had tried modifying the grub conf before, and that fixed the brightness but had the undesirable effect of causing the system to freeze. Your solution finally did the trick.

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Raj.

  • Malik

    Thanks Abhishek it worked for me “Linux Mint 16 Cinnamon 64 bit” on Dell inspiron 15 3521

    • http://itsfoss.com/ Abhishek Prakash

      Thanks for the info that it works on Linux Mint 16 as well.

  • Lazlo

    XUbuntu 14.04 : It works !

  • Amar Prabhu

    For those who this fix did not work (it didnt for me), do the following:

    Update your Grub file, line no 11 in /etc/default/grub to

    GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi_backlight=vendor”

    update grub using the command

    update-grub

    Reboot and you are done.

    • Sumi

      Hi Amar,
      this worked for me like a charm.

      Thanks.

      • Amar Prabhu

        Cool. Glad it helped.

        • jbase78

          worked on my acer aod257-1471 netbook. Thanks Amar!

    • kai

      Thank you, this worked for me. The font seems weird though.

    • Sycokinetic

      I didn’t run update-grup yet, but editing the file and rebooting seems to have fixed all of my function keys. I’m not sure why adding acpi_backlight=vendor would affect more than the backlight, but for now I’m not complaining. :)

    • John Weland

      Great work, now I just need to know what commands to use for my shortcut keys.

    • ANG

      I edit the text, but when I go to save it I get an error “Can’t open file to write” Any suggestions?

      • Amar Prabhu

        Check your permissions.

        • ANG

          Permissions were checked. I spent a few hours trying to find why it wasn’t working when all of a sudden everything clicked and came into play. The fn keys work great now. Thanks!

      • http://itsfoss.com/ Abhishek Prakash

        Try to put write access on the file

    • Adam

      how do i edit it

      • Amar Prabhu

        VIM or any other editor. Open it with Super User permissions.

    • Bernardo

      The best solution I have found.

    • Juan

      Thank you Amar!

    • xsoultribex

      i have this kind of set up but its not working in fn

    • http://www.itoole.com/ Shubham Rajdhar

      Thanks my savior! :D

    • Anu

      works great!!! Thank you

    • Amitava Sutradhar

      not working for me.

    • Thomas

      Thank you so MUCH! I’ve been wrestling with this for months!

  • Manoj

    Awesome. Thanks yaar…

  • eaglgenes101

    What about those that jumped the gun and installed mir?
    Same procedure? Or do I work with the mir files instead?

  • Pingback: Brightness Fix for Ubuntu | Hariharan's Blog

  • Bruno

    Works in Latitude 3540!

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  • petra

    thanks, works great for Dell Vostro 3560 and Mint 16

  • Vitor

    Wow, Linux is so intuitive, it amazes me, ugh.

    Anyway, this fixed the problem for me, thanks.

  • Dumas V

    This did not work for me. When I added the code mentioned above, I get a black screen and will not boot back into Ubuntu. Also, since this is a clean install when booting before this, I have never gotten a screen to allow me to select recovery mode, it normally just boots in Ubuntu from turning on the machine.

    Is there anyway to recover without having to install the OS again?

  • Anto

    thanks a lot, it works :D

  • Pingback: Many Things To Do After Installing Ubuntu 14.04

  • mkrooted

    Thanks very much! It works!

  • fero bernath

    hi guys, this initially broke my Ubuntu 14.04 installed on Packard Bell EasyNote TX86 because the firs quotemark is superfluous. Correctly it should read:

    Section “Device”
    Identifier “card0″
    Driver “intel”
    Option “Backlight” “intel_backlight”
    BusID “PCI:0:2:0″

    EndSection

    Once I corrected the entry, all is OK and the hardware buttons for screen brightness work like a charm. Hope it helps.

    • http://itsfoss.com/ Abhishek Prakash

      Hi Fero,

      If you copy paste it, the first ” will not appear.

  • Angalan

    Doen’t work even for me…
    Samsung NP900X3D

    for command: ls /sys/class/backlight/:
    intel_backlight samsung

  • ameer

    amazing! thanks a lot man, thank you so much!

    • http://itsfoss.com/ Abhishek Prakash

      welcome..

  • monika

    couldn’t do.. this is coming -> “touch: cannot touch ‘/usr/share/X11/xorg.conf.d/20-intel.conf’: Permission denied ” after entering this “touch /usr/share/X11/xorg.conf.d/20-intel.conf”.. help me asap..

    • http://itsfoss.com/ Abhishek Prakash

      try sudo before it. I am editing the article.

      • monika

        thanks .. :D it worked :D

  • monika

    i hv ubuntu 14.04

  • http://www.mdcconcepts.com/ Aniket

    for lenovo z570 and similar use ” echo 150 > /sys/class/backlight/intel_backlight/brightness ” in terminal with root access.

    For diffrenet brightness, change 150 to any othe number (ex. replace 150 to 250 for more brightness)

    • http://itsfoss.com/ Abhishek Prakash

      Thanks for sharing Aniket. I hope it works for many.

  • Lyes Alger

    waw its ok for me thx a lot

    • http://itsfoss.com/ Abhishek Prakash

      glad it helped you

  • Ali Rıza Şahinkaya
    • http://itsfoss.com/ Abhishek Prakash

      The link is not in English but it may help someone. Thanks.

  • nicolausgr

    Great! It works perfectly on a Dell Inspiron with Intel Graphics card & Ubuntu 14.04. Thanks!

    • http://itsfoss.com/ Abhishek Prakash

      welcome

  • Martin

    Finally!!! Thank you for this solution! I updated my eeepc from Lubuntu 13.10 to 14.04 and suddenly the brightness problem appeard. But with the configuration file:

    sudo touch /usr/share/X11/xorg.conf.d/20-intel.conf

    Now we need to edit this file. You can use any editor be it a terminal one or graphical.

    sudo gedit /usr/share/X11/xorg.conf.d/20-intel.conf

    Add the following lines to this file:

    Section “Device”
    Identifier “card0″
    Driver “intel”
    Option “Backlight” “intel_backlight”
    BusID “PCI:0:2:0″

    It works!!!! Thank you!!!!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Martin :)

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  • http://followthegeeks.com Mohamed Semlali

    It works on 14.04.

  • lemming

    great work, dude! After searching for a solution on my eeepc 1215n (editing grub didnt work) for days (cummulative) you finally brought light to me (shining through my screen into my face now)! thanks alot, man!

  • Redga

    It worked lika a charm!! Thank you so much.

    Every time that I power on, the brightness is at full, is there any way that the system “remembers” the level of brightness in which I power it off?

  • Howard

    it works for me. Thanks!

    • Howard

      btw my model is lenovo w540 ubuntu 64 trusty

  • snaprails

    You Star! Worked a treat on Packard Bell Easynote TJ65. Lack of brightness control had been annoying the hell out of me since install :-)

    • http://itsfoss.com/ Abhishek Prakash

      welcome

  • Prashant

    Thank you very much !!

    • http://itsfoss.com/ Abhishek Prakash

      welcome Prashant

  • ishan bakshi

    hi, i could not find the 20-intel.conf file in this location: /usr/share/X11/xorg.conf . My graphics driver is “Mobile Intel® GM45 Express Chipset x86/MMX/SSE2″. Any suggestions plz ?

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  • jeremy5321

    Some using ubuntu 14.04 and LM17 might need to add video.use_native_backlight=1

  • shthek

    worked like a charm for me. Thanks!

  • Pingback: Ubuntu 14.04 Intel Brightness After Resume - Tech Forum Network

  • lucky

    Worked for me, thanks!! Lenovo z570 with Ubuntu 14.04.

  • ubermook

    You are a genius! I had been searching for a solution for this for so long and it has worked. Now I can use my Lenovo b570 with Linux on battery. At last. Thank you!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome ubermook :)

  • WayOutt

    Man!THANKS!!!!Lenovo v570 (i3 2310 geForce 525,OpenSuse Tumbleweed) works with xorg & grub flags.

    • http://itsfoss.com/ Abhishek Prakash

      Welcome :)

  • Jilguero ostras

    Thank you very much. It also works on Ubuntu 13.10.
    Jilguero.

    • http://itsfoss.com/ Abhishek Prakash

      You are welcome Jilguero

  • http://www.it-consulting.am Vahe Sahakyan

    Hi, thank you very much.

    Perfect solution !!!!

    I have same problem with my HP Probook 470g0. with the graphic card Intel® Ivybridge Mobile.

    It’s works and fixed the issue.
    Thank’s again
    Vahe

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Vahe :)

  • Mihai

    Thanks!!!

    Had the same issue on a HP Probook 4540s – Ubuntu 14.04.

    Problem solved!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Mihai

  • Seji

    Works perfectly on Linux Mint 17 @ ASUS UL80-VT

    • http://itsfoss.com/ Abhishek Prakash

      Glad to hear that :)

  • gomaaz

    saved my day on Xubuntu 14.04 64bit. Thanks!

    • http://itsfoss.com/ Abhishek Prakash

      good to hear that :)

  • Gleise

    Thanks a lot! I just upgraded my Ubuntu 12.04 to 14.04 and had no idea what was happening. Your post saved me a lot of time.

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Gleise

  • John Weland

    So I followed this tutorial and it didn’t work… at first. I then followed the “featured comment” by Amar Prabhu and my brightness control DOES work now via slider however I still have to setup my shortcut keys and I’m not sure what command I need to send on the hotkeys to make it work.

  • ANG

    Abhishek, I can create the file but when I try to edit the text and save it I get an error that I don’t have permissions to do that. I’m on 14.04. What would you suggest?

    • http://itsfoss.com/ Abhishek Prakash

      Did you try sudo?

      Also, can you put the write access on it using command line:

      sudo chmod u+w /usr/share/X11/xorg.conf.d/20-intel.conf

  • jk

    Thanks, work fine for me. Ubuntu 14.04

    • http://itsfoss.com/ Abhishek Prakash

      welcome jK

  • Dan

    Awesome! Thanks

    • http://itsfoss.com/ Abhishek Prakash

      welcome

  • ミチャルド

    Thanks! It worked at the first try! :D

    • http://itsfoss.com/ Abhishek Prakash

      welcome :)

  • esculapweb

    thanks! it works for me and now my eyes can work again)

    • http://itsfoss.com/ Abhishek Prakash

      welcome :)

  • Kuro

    Has any one figured out a legit way to fix the brightness issues on a computer that has an Nvidia graphics card? Because I have been looking around for a while and I haven’t had any luck…..

    My graphics card as stated in my detail: GeForce GTX 660M/PCIe?SSe2

  • Hnizil Mehdi

    thanks lot .

    • http://itsfoss.com/ Abhishek Prakash

      Welcome

  • Michael Garofano

    The standard fix on this page worked HP 8440p, Xubuntu 14.04

  • kinjal

    It worked for me. I installed Ubuntu 14.04 on Dell Inspiron series laptop and lost brightness control function. Got your steps fix this problem at first attempt. Thanks

    • http://itsfoss.com/ Abhishek Prakash

      You are welcome Kinjal

  • Kevin

    Many thanks, worked on my Samsung S3510 Laptop with Mint 17.

    Just make sure you don’t copy the first “

    • http://itsfoss.com/ Abhishek Prakash

      It shouldn’t be copied. Its just themes that puts ” before quotes.

  • Kaushal

    Worked perfectly on Acer Aspire V3 on Ubuntu 14.04 with Intel® Ivybridge Mobile. Thanks! :)

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Kaushal.

  • jonah

    thanks dude, worked perfect on my sony vaio

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Jonah

  • tim lion

    fuck yeah!
    worked for me, thanks mate…

    • http://itsfoss.com/ Abhishek Prakash

      you are welcome Tim :)

  • anom

    Not only did this not work, but the limited information given in this tutorial caused me to ruin the graphics driver. Now mdm will not start. Thanks a lot.

    • http://itsfoss.com/ Abhishek Prakash

      you can revert the changes from the command line at login and reinstall unity again.

  • parkcity

    Thanks works great!! is therea way to dim even more? can you please tell us which file to configure?

  • aby337

    works great..THANK YOU :)

    • http://itsfoss.com/ Abhishek Prakash

      Welcome

  • Alaskan

    thank you :)

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Alaskan..

  • Orestis Gorgas

    The article method worked for Inspiron 15 3521.

  • Tsvetelina

    Thank you it worked! :)

    • http://itsfoss.com/ Abhishek Prakash

      Welcome :)

  • xsoultribex

    20-intel.conf i dont have this kind of file.. can you tell me why? im using ubuntu 14.04 LTS kernel 3.13.0.32 generic

    • http://itsfoss.com/ Abhishek Prakash

      You’ll have to create it.

  • Ati Rosselet

    worked for opensuse 13.1 on vostro 3560 w/radeon+intel
    Thanks – now I have screen brightness control back!!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Ati :)

  • Thejas

    Thanks for the blog. Brightness settings were configured successfully on my dell intel laptop.

    • http://itsfoss.com/ Abhishek Prakash

      You are welcome Thejas

  • Venk

    it worked !!!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Venk

  • guestname

    Worked for my Asus UL50VT w/ Mint 17! Thank you very much, I’m surprised that it was so simple to fix yet nobody else had something that worked for me.

    • http://itsfoss.com/ Abhishek Prakash

      Welcome. Things are often less complicated.

  • Karthik

    Hey thanks! It worked out well for me :)

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Karthik

  • Thatsme

    worked for my acer with Mint 17 and intel grafic

    • http://itsfoss.com/ Abhishek Prakash

      Welcome

  • pongapundit

    It worked for me! I had problems with brightness control on Linux Mint 16 Petra running on Dell Inspiron 3537. I spent hours searching on net but none of the tricks worked including setting GRUB_CMDLINE_LINUX_DEFAULT. But This simple fix given here, that is, adding a “device” section to the 20-intel.conf file (followed by log out / log in back) worked like a breeze. Good job Abhishek!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome :)

  • http://www.gadgetboi.wordpress.com/ gadgetboi

    i just don’t get it … it’s not working on my asus X200CA. first i somehow get error and could enter GUI, then i repeat it and could enter the GUI but even the brightness setting couldnt move (on the power setting) but somehow every function is working. and then i update the grub, this time the brighness setting on the power setting working but still no luck with the functon key :-( please help.

  • http://www.gadgetboi.wordpress.com/ gadgetboi

    you forget to mention to change line 12 from
    GRUB_CMDLINE_LINUX=””
    to GRUB_CMDLINE_LINUX_DEFAULT=””

    the Fn key works again but still it wont sync with the brightness setting on the power management setting … but it do the trick for now. let me know if you have solution for this :-D
    thanks

  • uburoi

    Hello Amar,
    I had the same backlight issues with my 12.04 after updating to kernel 3.13, but creating the 20-intel.conf just did the trick. Thank you very much! (It works even better than before, because now the brightness steps are smaller so I can adjust the backlight more precisely.)

  • WOJTEK

    Thank you very much! It does work for me – DELL VOSTRO 3560, Ubuntu 14.04.

    • http://itsfoss.com/ Abhishek Prakash

      Welcome

  • http://www.tododvdfull.com RiddicK23

    Works for my HP Pavilion dv7 with intel HD Graphics 3000 with Linux Mint 17… Thanks!!!!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Riddick23

  • esseafi

    Yes! Finally!! I have been trying to fix this all this week and this post was my solution. Thank you very much. – 14.04 on Intel PC

    • http://itsfoss.com/ Abhishek Prakash

      Welcome

  • Ali Rıza Şahinkaya

    If you having trouble with bumblebee after applying this method.
    Solution is adding following lines to head of
    “/etc/bumblebee/xorg.conf.nvidia”.
    Section “Screen”

    Identifier “Default Screen”

    Device “DiscreteNvidia”

    EndSection

    • http://itsfoss.com/ Abhishek Prakash

      Thanks for the tip. Hope it works for others.

      • Ali Rıza Şahinkaya

        I hope it works. In my case error messages;

        [ERROR]Cannot access secondary GPU – error: [XORG] (EE) intel(0): [drm] failed to set drm interface version: Permission denied [13].
        [ERROR]Aborting because fallback start is disabled.

    • Raphael Barros

      Tried opening Blender using it, the window decorations appeared, but nothing inside, the console showed this:

      libGL error: failed to load driver: swrast
      libGL error: failed to load driver: swrast
      primus: fatal: failed to acquire direct rendering context for display thread

      • Ali Rıza Şahinkaya

        I will investigate it. For me blender works normally.

      • Ali Rıza Şahinkaya

        Is virtualgl installed and bbswitch enabled?

  • dj

    thanks a ton mate!!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome

  • Rubi Sharma

    Thanks .It really works..

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Rubi

  • Rajesh Nair

    How to Make it Work like Windows (auto Brightness When Charger is connected or Disconnected )

  • Viraj Nikam

    Thanks it worked great for me, the only problem is when I switch the brightness level to minimum the display goes completely dark.

  • Elad Avron

    Worked like a charm. Thank you!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Elad

  • eioj

    thanks :)

    • http://itsfoss.com/ Abhishek Prakash

      Welcome

  • Julien

    It works for Mint 17 on Toshiba R700 with an Intel graphics card.
    Thanks a lot!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome…

  • Fibonacci

    Hey Abhishek! I have another related issue. I have nvidia 840M graphics card on my machine. But when i type in “lspci| grep VGA” in the terminal, it only shows the intel card. Isn’t ubuntu recognising my nvidia card?

    • http://itsfoss.com/ Abhishek Prakash

      Hi Fibonacci,

      Your Nvidia graphics is not being used, at least for video. You may want to reinstall the Nvidia drivers.

  • Anand

    Thanks a lot mate. it did work for me

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Anand.

  • Abhay Mehta

    It didn’t work properly on my Sony vaio. Even after doing this my laptop giving me message like the system is running on low graphics mode and stopped at that point and did not start. Then I enter into single tty1 session and removed the 20-intel* file then I was able to start my laptop. So can you tell me the reason of this and give me the solution of brightness problem…

  • Diego

    Great thank you. It did work in my case (Xubuntu)

    • http://itsfoss.com/ Abhishek Prakash

      Welcome

  • Nicolas Hasbun

    Thanks !! brightness buttons dont working was annoying me.

    Works like a charm now :)

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Nicolas

  • Ioana Pavel

    Thanks dude, it worked :D I am super grateful. Cheers.

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Ioana

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  • Mushik

    Thanks pal, it worked good :)

    • http://itsfoss.com/ Abhishek Prakash

      You are welcome

  • nnnnnnnn

    this works on xubuntu thanks

    • http://itsfoss.com/ Abhishek Prakash

      Good to know :)

  • nnnnnnnn

    toshiba portege z830/835

  • beofos

    I love you

  • Prantik Saha

    Thanks. It has worked for me. Nice work.

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Prantik

  • coolguest

    When I did ls /sys/class/backlight/ it didn’t return anything. I think I’m suppose to have the intel one because i have the integrated graphics.

    • http://itsfoss.com/ Abhishek Prakash

      Which graphics card is in use at: System Settings->Details->Graphics?

  • harris

    about brightness i have grafics : Gallium 0.4 on AMD RV635 can i do the same thing as you said?

    • harris

      and my prossesor Intel® Core™2 Duo CPU P8400 @ 2.26GHz × 2

      • http://itsfoss.com/ Abhishek Prakash

        I would NOT recommend it.

  • Erik Torres

    Thanks for the tip. It works for my Toshiba Portege with Sandy Bridge architecture and Intel graphics.

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Erik.

  • Armo

    the fix worked and now i am able to adjust brightness but fn + f4 & fn + f6 still dont work…any ideas?

  • vishwa2014

    Thank you so much the brightness control is working in my laptop.
    Thank you for posting thank you again.

    • http://itsfoss.com/ Abhishek Prakash

      Welcome :)

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  • Randolph Lima

    Funcionou perfeitamente! Obrigado!

  • AMbro86

    How would I do this with an Nvidia card in my ThinkPad? I have a T61p with an Nvidia Quadro FX 570M. When I run the above ls command I get only one output though:

    thinkpad_screen

    Any ideas?

    P.S. I already tried the GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi_backlight=vendor” and it didn’t work. In fact it undid an earlier fix for my machine not shutting off completely.

    I’m on 14.04.

  • artgel dA

    thanks !

  • Ashok Naval

    please tell me how can i blacken the screen with shortcut key. e.g. i want to download something but want to study in front of laptop, so during that time i want to blacken my screen. in previous version of ubuntu, i used to do this with ctrl+Alt+L, but in 14.04 it just locks the screen and scree brightness is same. please help

  • frank

    Thank you Sir soo much. Work for me – I try Brightness Controller and nothing, but this is amazing! : )
    Just install Zorin 9 and control brightness on my Acer 5733!

  • Leandro Quibem Magnabosco

    It works, thanks!

  • Mikhail Cherepanov

    Thank You very much, solution with configuration file works perfectly on asus x551ma with 14.04.

  • HappyGuest

    Hello

    GREAT !!! :o)

    Works with “Ubuntu 14.04 LTS”, live USB (UEFI boot), on “Acer Aspire E3-111″ with “Intel® Bay Trail” graphic chip onboard .

    Thanks !

    Regards,

    Steve.

    • http://itsfoss.com/ Abhishek Prakash

      Glad you are happy Steve :)

  • Prakash Bala

    Works like a charm!!!! Much appreciated!!!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Prakash

  • Sumudu

    it is work bro thank you very much !!!

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Sumudu

  • skyrohithigh

    Thanks, worked for me

    • http://itsfoss.com/ Abhishek Prakash

      You are welcome

  • Sreekar

    Worked for me..thanks

    • http://itsfoss.com/ Abhishek Prakash

      Welcome Sreekar

  • Kld Dlk

    Thank you very very much, you saved my eyes.

  • ByThe River

    Worked for me, thank you so much!

  • Donna

    Thanks for the brightness fix!

  • Arshit Aggarwal

    thanks for this solution….it worked for me !!

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  • Matt Ndk

    For all of you running a Laptop with NVIDIA Card and who are still not able to get the f* function keys for brightness to work, just follow the steps below. It worked very well for my system (Samsung q45, Intel Dualcore T7100 @ 1,8Ghz , Nvidia Geforce 8400M G 512) running Linux Mint 17.

    In command line, type in:

    sudo gedit /etc/X11/xorg.conf

    You will have to enter your root password.

    Now, you should see:

    ___________________________________________________

    Section “Device”

    Identifier “Device0″

    Driver “nvidia”

    VendorName “NVIDIA Corporation”

    EndSection

    ___________________________________________________

    If you see nothing, just enter all the lines above and follow up with the next step below

    Under the VendorName Line, add the following:

    ______________________________________________________

    Option “RegistryDwords” “EnableBrightnessControl=1″

    ______________________________________________________

    Now, save and reboot. Check your brightness controls, and hopefully this fixed things.

    I’ve tried so many solutions out of the net and nothing had helped me until I came to this solution. But be aware that these steps only working for NVIDIA Grafics and you must have chosen the NVIDIA Driver in your system in “Administration -> Driver Manager”.