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Might need more than one reboot.Also, when you use the F-keys, the Fn key should be pressed down continuously while you repeatedly & gently tap the F5 or F6 key until you get the brightness level you want. Failing the above, add "Linux" to the GRUB_CMDLINE I mentioned in post#4, so that it reads:Code: [Select]GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"Might be a longshot, but it worked in Manjaro.
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi=Linux"
For screen brightness control, the Fn-key combinations can be:Fn+F5 - decrease brightnessFn+F6 - increase brightnessYou should see a 'brightness icon' stuck on the relevant keys on your keyboard for the control of screen brightness.To get the Fn-keys to work, you will need to edit a line in the /etc/default/grub file. To do this open your terminal and type...Code: [Select]gksudo leafpad /etc/default/grubThe grub file will then open on your screen. Then look for this line in the file:Code: [Select]GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"Then add acpi_osi= to this line as follows:Code: [Select]GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="Then save the grub file:Code: [Select]sudo update-grubOn reboot, the Fn+F5 and Fn+F6 brightness keys should function ...The link bitsnpcs gave you in post #3, describes using the terminal to fix the level of brightness. While I'm sure this will work, it is more practical and immediate to use the Fn-keys as you can continuously vary the brightness to whatever level you wish, at a the touch of your keyboard. Keyboards on modern gaming computers can have a backlight, which can also be controlled by Fn-key combinations. If yours is one of these, let me know and I'll try and help.
gksudo leafpad /etc/default/grub
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi="
sudo update-grub
Does this solution work ? - https://askubuntu.com/questions/798203/changing-screen-brightness-through-keyboard-functions-on-my-notebookWhere the tutorial arrives at editing the shortcuts, on LL do -Menu>All>Keyboard>Application Shortcuts
Hello penglezos,what is the laptop brand and model ?