Hold down the Shift key while restarting, or if this doesn't work, keep tapping the Shift key. If you have only one operating system installed, then a Grub Boot Menu may not be displayed. Then remove the command in the /etc/default/grub file, and in the Terminal run: sudo update-grub This change is just temporary and allows you to start your system. Remove the command you added between the words “splash” and “$vt_handoff” Linux /boot/vmlinuz.ro quiet splash $vt_handoff If this happens then restart and select the correct operating system at the Grub Boot Menu and then press e. Sometimes making changes to the grub file can cause startup problems. GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi=noirq acpi_osi=Linux acpi_backlight=vendor” GRUB_CMDLINE_LINUX_DEFAULT="quite splash acpi_osi=Linux acpi_backlight=vendor" GRUB_CMDLINE_LINUX_DEFAULT="quiet splash acpi_osi='!Windows 2012'" GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash acpi_osi=Linux” Then run this command in the Terminal: sudo update-grub. Open the Terminal and type:Ĭhange the line: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" If the backlight now has full illumination then try adding a command to the grub boot file. Sudo echo 3 > /sys/class/leds/asus\:\:kbd_backlight/brightnessĮcho 3 | sudo tee /sys/class/leds/asus\:\:kbd_backlight/brightness Sudo echo 7 > /sys/devices/platform/samsung/leds/samsung\:\:kbd_backlight/brightnessĮcho 7 | sudo tee /sys/devices/platform/samsung/leds/samsung\:\:kbd_backlight/brightness
First check to see if the kernel has control of the backlight by running this command for a Samsung laptop in the Terminal:
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