I got a 4G modem for my ThinkPad X1 Carbon: the EM7455.

The fingerprint reader in the ThinkPad X250 has the same hardware ID as the X240: 138a:0017 Shame is, that ID still doesn’t seem to be supported in the stock libfprint. Good thing someone forked it and added drivers for newer devices. Before that we need fingerprint-gui installed, without it there’s no fingerprint login or any of that: sudo add-apt-repository ppa:fingerprint/fingerprint-gui sudo apt-get update sudo apt-get install libbsapi policykit-1-fingerprint-gui fingerprint-gui