[Seek Help] Can't lower the screen brightness
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deepin
2023-02-09 01:12
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Hello

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.

please help

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la******co@gmail.com
deepin
2023-02-14 00:02
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deepin
2023-02-21 09:42
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deepin
2023-03-16 18:57
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deepin
2023-05-10 22:50
#4
  1. 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.

  2. 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_backlight.png

  3. 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.

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xbacklight -set 20              # set brightness to 20%
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