Lenovo ThinkPad X1 Carbon (Gen 4)
Lenovo ThinkPad X1 Carbon, Gen 4.
To ensure you have this version, run dmidecode:
# dmidecode -t system | grep Version Version: ThinkPad X1 Carbon 4th
Updating the UEFI works like described here: link ThinkWiki BIOS Upgrade/Using UEFI.
|Wireless network configuration#iwlwifi||Yes|
|microSD card reader||Yes|
An open source Linux driver prototype has been developed by reverse engineering the Windows driver. The project seems to have died while in early testing. 
The fingerprint reader included with this model `138a:0090 Validity Sensors, Inc` currently lacks an official linux driver. libfprint bugreport. Synaptics (which has acquired 'Validity Sensors') has unofficially said that they cannot disclose the protocol, but may possibly release a binary driver.
There are two options for displays:
- 14" FHD IPS (1920 x 1080): Works
- 14" WQHD (2560 x 1440): Works
Mini DisplayPort: Works
There are several cards used:
- Intel Dual Band Wireless-AC 8260, 2x2
- Intel WiGig 18260 AC 2x2
All cards feature BT4.1 connectivity and should work out of the box when starting the bluetooth service
There are several cards used
- 4G LTE (Huawei ME906S) - Tested, stable and working.
- Qualcomm Snapdragon X7 LTE-A (Sierra Wireless EM7455) - ??.