I'd like to run custom scripts on docking or un-docking my ThinkPad X220.

Obvious place is some udev rule, but what events or attributes should I use? Another option is acpi. Is it better option? What else comes as viable alternative? I am running Debian, a mix between squeeze, backports, wheeze... and sid. Is there any native solution?

  • I have no way to test this myself but here's a suggestion: look through the messages generated by the kernel dmesg or syslog messages to check what messages are generated when you dock/undock. If you do see a notification you should be able to tie the event that generates the message to your script.
    – dinesh
    Feb 23, 2013 at 16:56

2 Answers 2


You can also use ACPI events to hook into the docking/undocking events if you install the ThinkPad kernel module: https://feeding.cloud.geek.nz/posts/hooking-into-docking-undocking-events-to-run-scripts/


I found the right tool on top of udev (and other low level interfaces like sysfs), configurable to everyone's taste. It's called laptop-mode-tools one of zilions of Debian packages (available for other distros at https://wiki.archlinux.org/title/Laptop_Mode_Tools).

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