Current Kernel 4.4 RC6 is not problem. System Information Manufacturer: LENOVO Product Name: 20BSCTO1WW Version: ThinkPad X1 Carbon 3rd
uname -r 4.4.0-040400rc6-generic
uname -a Linux Lucy 4.4.0-040400rc6-generic #201512202030 SMP Mon Dec 21 01:32:09 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Current Kernel 4.4 RC6 is not problem.
System Information
Manufacturer: LENOVO
Product Name: 20BSCTO1WW
Version: ThinkPad X1 Carbon 3rd
uname -r -generic
4.4.0-040400rc6
uname -a -generic #201512202030 SMP Mon Dec 21 01:32:09 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
Linux Lucy 4.4.0-040400rc6