I'm on an X1 Carbon 6th Gen. Suspend has been working flawlessly when on mains power. On battery power however, it fails from time to time.
The work-around of enabling Wake-on-LAN worked for me. I noticed that it was set to "External power only" (sorry, can't remember the exact wording in the BIOS) - setting it to "External and Battery Power" seems to have solved the problem.
I'm on an X1 Carbon 6th Gen. Suspend has been working flawlessly when on mains power. On battery power however, it fails from time to time.
The work-around of enabling Wake-on-LAN worked for me. I noticed that it was set to "External power only" (sorry, can't remember the exact wording in the BIOS) - setting it to "External and Battery Power" seems to have solved the problem.
I'm using BIOS 1.27, released 2018-07-18.