My personal blog around GNU/Linux


Most of them during installation of Fedora on HP or other laptops would have encountered the problem that after the installation of the Operating system, Backlight of the laptop display would have been disabled, and it would be difficult to pass through initial steps to complete the installation, and i somehow managed to complete those steps by taking my laptop to a place full of brightness like house windows or terrace (during morning) and with the help of the reflection of that light completed those steps and then logged in successfully.

After you have done that, here is the solution to fix this issue when you will face next time you log in:

Step 1: Open your Terminal

Step 2: Type the following in your terminal

cd /etc/default

sudo gedit grub

Step 3: The grub file would have opened now with the Gedit text editor, now find the line which starts with ” GRUB_CMDLINE_LINUX =” and append the following text somewhere in the middle or at last or even at the first”

acpi_osi=Linux acpi_backlight=vendor

Step 4: Now save the file and close the text editor and get back to terminal and update the grub as follows

grub2-mkconfig -o /boot/grub2/grub.cfg

Step 5: After grub has been successfully updated, reboot the system and check whether are you getting the backlight working like charm and it should definitely work on HP laptops, even it should work on other laptops too. If not please comment below, we can seek for better solution.

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Comments on: "[Solved] Laptop Backlight not enabled during login in Fedora" (7)

  1. it works but the initial back-light at boot is always 0. every time i boot I have to press the fn+right to set a higher back-light value to see the image

  2. nicholas meiboom said:

    it did not work. it went back to fall backmode because it readded onmodset.

  3. Arun Prasath said:

    Hey dude…

    Actually it worked for me in the startup screen but i was not able to increase or decrease the brightness while i’m working in my laptop using function key combination…

    Later I found this solution,

    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:

    GRUB_CMDLINE_LINUX_DEFAULT=”quite_splice”

    GRUB_CMDLINE_LINUX_DEFAULT=””

    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.

    SOURCE : http://www.refreshit.info/2012/08/solved-brightness-increase-and-decrease.html

    Hope it helps others…

  4. Benedito Santos said:

    Thanks !!!

    It worked for me on my notebook CCE, using Fedora 19.

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