How to fix the issue of Ubuntu brightness adjustment not working?

If you are unable to adjust the brightness on an Ubuntu system, you can try the following solution:

1. Update your graphics card driver: Make sure your graphics card driver is up to date by running the following commands in the terminal: sudo apt update sudo apt upgrade.
2. Installing additional drivers: Some laptops may require extra drivers to adjust the brightness properly. You can install these additional drivers by running the following command in the terminal: sudo apt install xbacklight
3. Install brightness adjustment software: If the above methods do not work, you can try installing third-party brightness adjustment software, such as “brightness-controller” or “light”. These programs can help you adjust the screen brightness.
4. Check for hardware issues: If the above methods still do not work, it may be a hardware problem causing the inability to adjust the brightness. It is recommended to contact the manufacturer or a professional to check for hardware issues.

I hope the above methods can help you solve the issue of being unable to adjust the brightness on your Ubuntu system.