Business laptops manufactured by Lenovo and IBM under the ThinkPad brand have a proprietary connector at the bottom of the laptop that is used in junction with docking stations that enable the ThinkPad to be used as a desktop PC.
These docking stations can function in two ways:
- Passive port replicators (no active components)
- Active docks (active components such as USB hubs or USB 3.0 controllers)
To handle docks outside KDE and GNOME you will need to install a dock daemon that will auto-switch the monitors. AUR is a dock daemon that was developed for light desktops and will auto switch the monitor configuration.
Install the AUR package.
The daemon needs to know your current display configuration when the laptop is docked and undocked, so we need to configure the daemon first before using it.
- Insert your ThinkPad into the dock
- Configure the display layouts and resolutions using your desktop environments interface or xrandr
- Write the profile when the ThinkPad is docked
# dockd --config docked
- Remove the ThinkPad from the dock
- Configure the internal panel resolution and refresh rates using your desktop environments interface or xrandr
- Write the profile when the ThinkPad is undocked
# dockd --config undocked
# systemctl enable acpid # systemctl start acpid
exec --no-startup-id dockd --daemon
- Log out and log back in
The daemon should now be configured and ready to use. Insert the ThinkPad into the dock and observe if the daemon switches to your external display automatically.
Dock and undock hooks
As of dockd 1.21, you can define some hooks that run when the ThinkPad is docked and undocked.
For example, to disable WiFi when docking and enable it when undocking:
nmcli radio wifi off
nmcli radio wifi on
Troubleshooting headset microphone on 4X10E52935 dock
This dock appears to use an OMTP standard wiring for the headset connector instead of the more common CTIA standard. Thus the pins (from tip to sleeve) are left channel, right channel, microphone, ground instead of left channel, right channel, ground, microphone. Adapters can be found by searching "3.5mm OMTP to CTIA adapter" on your favorite e-commerce site.
USB issues while docked
If you run TLP and your USB device experience disconnect or erratic behaviour when docked while booted on battery you might want to change the following setting:
# Runtime Power Management for PCI(e) bus devices: on=disable, auto=enable RUNTIME_PM_ON_AC=on RUNTIME_PM_ON_BAT=on # Runtime PM for *all* PCI(e) bus devices, except blacklisted ones: # 0=disable, 1=enable RUNTIME_PM_ALL=0
Then reload the configuration by running
tlp start with root privileges.