In this comprehensive guide, we will walk you through several methods to fix the brightness control issue in Ubuntu 18.04 LTS, particularly for systems with an Intel Graphics Card.
Understanding the Problem
In some cases, users of Ubuntu 18.04 LTS may experience issues with controlling the brightness of their display. This is particularly common with certain graphics cards, including Intel. The brightness control keys on the keyboard may not respond, or the brightness slider in the system settings may not work as expected.
Before we begin, it’s crucial to note that the following methods involve modifying system files. Therefore, it’s recommended to backup your data before proceeding.
Solution 1: Modifying the GRUB File
The first solution involves modifying the GRUB bootloader file.
- Open a terminal (Ctrl+Alt+T) and type the following command to open the GRUB file in a text editor:
sudo nano /etc/default/grub
- Find the line that reads:
- Change this line to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=vendor". The
acpi_backlight=vendorparameter tells the system to use the specific backlight control method provided by your graphics card vendor.
- Press Ctrl+O to save the file, then Ctrl+X to exit the editor.
- Update GRUB with the following command:
- Reboot your system to see if the brightness control is now working.
Solution 2: Creating a Backlight Configuration File
If the first solution does not work, you can try creating a backlight configuration file.
- Open the GRUB file as in Solution 1 and change the same line to:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_backlight=video". The
acpi_backlight=videoparameter tells the system to use the generic video driver for backlight control.
- Save and exit the file as described in Solution 1.
- Create a new file
/usr/share/X11/xorg.conf.d/80-backlight.confwith the following content:
Identifier "Intel Graphics"
Option "AccelMethod" "sna"
Option "Backlight" "acpi_video0"
This configuration file tells the X server to use the “sna” acceleration method and the “acpi_video0” backlight control for the Intel Graphics card.
- Save the file and exit the editor.
- Update GRUB again with
- Reboot your system.
Solution 3: Installing Brightness Controller
If neither of the above solutions work, you can try installing the Brightness Controller, a dedicated software for controlling brightness in Ubuntu.
- Open a terminal and run the following commands:
sudo add-apt-repository ppa:apandada1/brightness-controller
sudo apt update
sudo apt install brightness-controller
These commands add the Brightness Controller repository to your system, update your package list, and install the Brightness Controller.
- After the installation, you can access the Brightness Controller by searching for it in your applications.
In this article, we’ve covered three potential solutions to fix the brightness problem in Ubuntu 18.04 LTS on Intel Graphics Card. If none of these solutions work, there may be other underlying issues specific to your hardware or configuration. In such cases, it is recommended to seek further assistance from the Ubuntu community or consult relevant forums for troubleshooting steps specific to your situation.
Remember, it’s always crucial to backup your data before making any changes to system files. Happy troubleshooting!
The solutions provided in this guide are specifically targeted towards systems with an Intel Graphics Card. However, you can try the solutions mentioned as they may work for other graphics cards as well, but there is no guarantee. It is recommended to search for specific solutions for your graphics card model or consult relevant forums for troubleshooting steps.
Yes, it is highly recommended to backup your data before making any modifications to system files. Although the solutions provided have been tested, there is always a possibility of unintended consequences or errors. Having a backup ensures that you can restore your system to its previous state if any issues arise.
If you want to revert the changes made to the GRUB file, you can open the file again using the command
sudo nano /etc/default/grub and change the line back to its original state:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash". Save the file and then update GRUB with
sudo update-grub. Reboot your system for the changes to take effect.
If none of the provided solutions work for your system, there may be other underlying issues specific to your hardware or configuration. In such cases, it is recommended to seek further assistance from the Ubuntu community or consult relevant forums for troubleshooting steps specific to your situation. They may be able to provide more tailored solutions based on your system specifications.
Yes, you can uninstall the Brightness Controller by running the following command in the terminal:
sudo apt remove brightness-controller. This will remove the software from your system.