I've installed linux,but I can't lower the screen brightness.I've tried shortcut but still not work
i install linux in my laptop.
Enable ACPI backlight keys
If the laptop's default brightness adjustment keys are not working, then add a boot time linux kernel parameter and try again.
First open up the /etc/default/grub file with your favorite text editor as root.
sudo nano /etc/default/grub
Find the line staring with GRUB_CMDLINE_LINUX_DEFAULT=, most probably there will be the word quiet also.
add acpi entry to linux screen brightness
Add a few words there, acpi_backlight=vendor all inside the double quote.
Save and exit the text editor and then reboot the laptop.
The acpi_backlight kernel parameter options are not just limited to vendor, and it's guaranteed to work. cubes 2048
You might have to experiment with other options like native and none . After rebooting if the brightness adjustment hotkeys are working then you can set a laptop's brightness with the xbacklight command.
If it's not installed, then install it with apt, sudo apt-get install xbacklight , and then run the command like below.
amazon prime logo
Try AmazonPrime for free
Enjoy free shipping and One-Day delivery, cancel any time.
xbacklight -set 20 # set brightness to 20%