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Try testing the setting by typing this command in terminal echo 0 > /sys/class/backlight/acpi_video0/brightness As this is a hardware setting, you really need to identify your hardware and research the settings first. If you get your setting wrong, most likely you will just loose your display, and have to reboot.
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You identify your pci bus address with sudo lspci | grep VGAĮxample 00:02.0 VGA compatible controller: Cirrus Logic GD 5446 The general syntax is sudo setpci -s f4.B=your_setting You can try to set your brightness with setpci You then adjust with the command line # For 80 % brightnessĪgain, add that to /etc/rc.local # command lineĪdd in, above "exit 0" xbacklight -set 80 You can also try xbacklight sudo apt-get install xbacklight If that works, add it to /etc/rc.local # command lineĪdd in your setting above "exit 0" echo 80 > /proc/acpi/video/VGA/LCD/brightness sudo echo 80 > /proc/acpi/video/VGA/LCD/brightness The output of that command varies a bit with hardware, 1 -> 10, 1 -> 12, 1 -> 100 ? Choose a value and set it (choose the value for your hardware). , you may need to browse the /proc/acpi directory to find the brightness setting and adjust the following commands accordingly. Note: Path may vary with hardware / kernel version, may be /proc/acpi/video0. If that does not work, you can try to manually set the brightness. Save your edit, update grub sudo update-grub # command lineĮdit the "GRUB_CMDLINE_LINUX_DEFAULT" line so it looks like this GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset acpi_backlight=vendor" If that works, edit /etc/default/grub and add those options to the default options. quiet splash nomodeset acpi_backlight=vendor To the kernel line add nomodeset acpi_backlight=vendor Some hardware may work with different options.Īcer - acpi_backlight=acer_acpi or even acpi_osi=Linux acpi_backlight=legacy.Īs you can see, you may need to google search for your settings. When you boot, at the grub screen, hit e to edit. This function, the backlight control, is dependent on your bios and kernel version.