The USB4 spec is based on Thunderbolt 3 and uses the Type-C connector.
Linux 5.6 will receive support for USB4, Phoronix reported on Sunday. The Linux 5.6 Kernel will likely debut by April.
USB4’s spec published in September and is based on Thunderbolt 3, with which it is backwards compatible. Intel's open-source department added the initial patches for USB4 in October.
The Linux 5.6 kernel will reportedly have both host and device support, as well as source code and a bunch of other features, thanks to leveraging the existing Thunderbolt code. It has also kept the code compact at just 2,000 lines of code.