By process of elimination, I was able to pinpoint the wakeup issue to sys-usb.

With further testing, I found that removing the USB-C Thunderbolt 3 Controller 
from sys-usb's device list resolved the issue.

Will test further to see if fiddling with Thunderbolt BIOS assist mode will 
help. Might a BIOS update might fix this? (The BIOS is on N23ET40W v1.15 from 
2018-04-13). Is there a way to update the BIOS without a Windows 10 utility?

Side notes:

1. Despite dmidecode reporting back the proper magic LENOVO and X1 Carbon magic 
strings, I still need to manually specify acpi_force_s3=5 into my xen.cfg, 
otherwise the kernel patch does not appear to work.

2. My aside about needing the LiveCD Lenovo trick was irrelevant. I can install 
from an install disk created with dd, so I don't know what I was doing wrong 
the first time.

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