Linux Solution Brightness Control Not Working In Fedora 23/ RHEL 7.2/ CentOS 7.1
Fedora/RHEL/CentOS :
In the linux world there are lot of Linux distributions are available. One of the fampus type is RPM (Redhat Package Manager) based Linux Distribution. The Fedora, Redhat Linux and CentOS is the some example of the RPM Based Linux Distros. Fedora is the Community based Distribution. it is perfectly fit for laptop, Notebook and some workstation for Individual users. It also used for some server and cloud environment. All updates are come first in fedora linux and then RHEL. The RHEL (Redhat Enterprise Linux) is the Enterprise Edition. It is based on the fedora project. And Redhat Linux is the paid OS. If you want to use the Redhat Linux you must active the subscription via redhat.com. It is perfectly fit for IT Solutions and it have the full support from the Redhat Company. The CentOS is based on the RHEL. The major vision of the CentOS is give the Redhat Enterprise Linux for free.
Brightness Problem in fedora/RHEL/Centos Linux :
Unfortunatelly all Linux Distributions are come with some issues or bugs. i found one problem in my laptop for the above Linux Os is Brightness Problem. When i press the Brightness Control key or Hot Key in fedora/RHEL/CentOS. The small brightness change window is appear and it get decrease or increase. But it does not give any effect my computer's actual brightness. It simply show brightness level get change and does not give any result. Many of people says after upgrading fedora 22 to 23 (or other version) my brightness controll does not work and some other people says Brightness Hot key doesn't give any effect from the begging of installtion. In google search i found the solution for the above problem thorugh the fedora project forums. I would Like to say thanks for those peoples.
Solutions :
Here i will give you 3 solutions to solve the Linux Brightness problem. i will give one hundred percentage assurance one of the 3 solution will work for you. ok lets start just login to your fedora/RHEL/CentOS linux and open the Terminal then type the following command.
First Solutions
You can perform the following command as the root user or the nomal by using the sudo. Make sure before using sudo command for normal user that user entry must added into the /etc/sudoers file. The file is accessable for root user only. If you are not the superuser please contact admin and add your entry into /etc/sudoers Files.
Create the directory /etc/X11/xorg.conf.d/ if it is not exist.
Root # mkdir /etc/X11/xorg.conf.d Normal User $ sudo mkdir /etc/X11/xorg.conf.d
Then run the following command as one command in your terminal. Just copy and paste into terminal. Use ctrl+shift+v key for paste text in terminal instead of ctrl +v
echo -e ' Section "Device"\n\tIdentifier "Intel Graphics"\n\tDriver "intel"\n\tBusID "PCI:0:2:0"\n\tOption "Backlight" "intel_backlight"\n EndSection' | sudo tee /etc/X11/xorg.conf.d/20-intel.conf
Finally Restart the X Session or reboot and see if the problem is fixed. Better to restart your System
Root User #reboot Normal User $sudo reboot
After reboot try to change brightness the problem is maximum fixec. If it is not work then try the second solution
Second Solution
Add some parameter to kernal via the grub file. You can do the to add some instruction to the appropriate file.
You can use your favorite text editor. Here i am using gedit (Graphic Editor) for text editing purpose.
Root user # gedit /etc/default/grub Nomal User $ sudo gedit /etc/default/grub
At the line which begins with GRUB_CMDLINE_LINUX= carefully add the parameter 'acpi_backlight=vendor' , thus the line will become something like this
GRUB_CMDLINE_LINUX="... rhgb quiet acpi_backlight=vendor"
Save and close your file and then update your grub by using following command.
Grub file location differ in Old Bios method booting system and Moderm UEFI method booting system. I will give you a different command for both methods. You can use the suitable one for your system
Make/Update grub2 config for Old BiOS Booting Method :
Root User # grub2-mkconfig -o /boot/grub2/grub.cfg Normal User $ sudo grub2-mkconfig -o /boot/grub2/grub.cfg
Make/Update grub2 config for Modern UEFI Booting Method :
Root User # grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg Normal User $ sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
Finally reboot your system.
Alternative Solution
If above technic is not working or If you’re using Linux kernel 3.13 or later, you can add the parameter into your /etc/default/grub instead:
GRUB_CMDLINE_LINUX="... rhgb quiet video.use_native_backlight=1"
Third Solution
If Both first and second solution is not work then try this solution for optional.
Try some parameters on kernel, via grub. You can do that if you edit the appropriate file.
Root user # gedit /etc/default/grub Nomal User $ sudo gedit /etc/default/grub
at the line which begins like this GRUB_CMDLINE_LINUX= carefully add the parameter acpi_osi= , thus the line will become something like this(do not change other parameters and leave a space between acpi_osi= and the next parameter)
GRUB_CMDLINE_LINUX="acpi_osi= vconsole.font=latarcyrheb-sun16 $([ -x /usr/sbin/rhcrashkernel-param ] && /usr/sbin/rhcrashkernel-param || :) rd.luks=0 rd.lvm=0 rd.md=0 rd.dm=0"
proofread, save the document and update grub configuration with following command
Make/Update grub2 config for Old BiOS Booting Method :
Root User # grub2-mkconfig -o /boot/grub2/grub.cfg Normal User $ sudo grub2-mkconfig -o /boot/grub2/grub.cfg
Make/Update grub2 config for Modern UEFI Booting Method :
Root User # grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg Normal User $ sudo grub2-mkconfig -o /boot/efi/EFI/fedora/grub.cfg
After you reboot the system, the problem might be fixed, but (usually) you will lose the indicator.
Final Words
I hope your Linux brightness problem will fixed one of these three solutions. It it is not please command and tell your problem. If you have some other problems or some other questions about linux please put it in the command section. i will try to give the solution for that. It is also very helpful for learn the new solutions. You are not a visitor of my blog you are my guest. i will try to give my best. Subscribe Email Newsletter for lastest Linux Howto's Tricks and problem solution. For any other queries please contact me by click the contact us page at the top of the blog. Thank you Have a Nice day. Happy blogging and love open source.
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