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If I have the power supply cable connected to the ThinkPad X390 here with the keyboard backlight switched off and then I disconnect and then reconnect the power cable, the keyboard backlight switches on. How can this be prevented? How can the state of the keyboard backlight be maintained?

  • Can you show ls -al /sys/class/leds/ My thinkpad has no keyboard backloght. – nobody Mar 10 at 9:19
  • Check for a keyboard backlighting setting in your BIOS. – heynnema Mar 10 at 22:26

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