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Ravexina
Asked: 2017-07-04 09:46:40 +0800 CST

Lenovo Thinkpad LED Blinking after waking from suspend

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I've got a Lenovo Thinkpad, "sometimes" after I wake the laptop from suspend both of its LEDs starts blinking, I can fix the issue by putting the laptop in sleep mode and wake it again (sometimes I have to do it more that of one time).

I know that I can reset their status from "blinking" to "on" using:

echo 0 on | sudo tee /proc/acpi/ibm/led

Is there any specific reason for this? as I can remember a blinking LED was the indicator of something has happened to the system.
And how can I fix the blinking automatically ?

16.04

1 Answers

  1. Best Answer

    Ubuntu 16.04 uses systemd as its init system, we can write a simple script which resets the LED status each time systems wakes from a suspend.

    Create a file here:

    /lib/systemd/system-sleep/

    Name it whatever you want, e.g: led. then make the file executable:

    sudo chmod +x /lib/systemd/system-sleep/led

    After that write these lines into the file using your desired editor:

    #!/bin/bash
if [ "$2" = "suspend" ]; then
    case "$1" in
        pre) /bin/true ;;
        post) /bin/echo 0 on > /proc/acpi/ibm/led ;;
    esac
fi

    It says if the event is a "suspend" (e.g: not a "hibernate") and we are in "post" mode (waking from not going into) write the 0 on in /proc/acpi/ibm/led which resets the LED.

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