I have tried different ways but it still doesn't work. I have also attempted to change the grub file. Screebrightness
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Please be more specific. What did you try? ` – To Do Jan 25 '21 at 08:02
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I have also created a new configuration file in /usr/share/X11/xorg.conf.d/. I have also tried to install brightness Controller - ppa:apandada1/brightness-controller. @ToDo – Ambrose Liu Jan 25 '21 at 21:41
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Try https://askubuntu.com/a/228835/27968 – To Do Jan 26 '21 at 10:00
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I have tried every method. Still not work. Is it because my laptop is running AMD RYZEN 7 instead of Intel i series @ToDo – Ambrose Liu Jan 27 '21 at 22:30
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Include that information in your question to get answers. – To Do Jan 28 '21 at 08:16