IBM Thinkpad T420

• CPU: Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz (2491.96-MHz K8-class CPU)
• Wireless: iwn0: <Intel Centrino Advanced-N 6205>
• Wired: em <Intel PRO/1000>
• Graphics: Nvidia NVS 4200M
• Bluetooth: Yes

• acpi_ibm seems to work just fine. No issues noted.
• Suspend/resume does work! (with FreeBSD-head at r265781)
• To make a dock appear as a secondary audio device, put the following in /boot/loader.conf

hint.hdaa.0.nid28.config="as=3 conn=Jack"
hint.hdaa.0.nid26.config="as=4 conn=Jack"

• Install FreeBSD 10.1 or FreeBSD 11 - CURRENT on Thinkpad T420 (https://www.banym.de, 2014.10.15)

• devinfo -v

• Upload acpi table