This has been found to be an issue with the BIOS firmware and will be fixed in a future update:
http://linux-thinkpad.10952.n7.nabble.com/Gen-2-Haswell-X1-Carbon-suspend-to-RAM-hang-td21039.html
This has been found to be an issue with the BIOS firmware and will be fixed in a future update:
http:// linux-thinkpad. 10952.n7. nabble. com/Gen- 2-Haswell- X1-Carbon- suspend- to-RAM- hang-td21039. html