Ok, tested with 4.15.0-041500-generic #201802011154.
The good news is that s2disk hibernate still works. However, the kernel
version not. On waking up, the system asks for the cryptswap password,
then mentions "resuming from /dev/mapper/cryptswap1". However, resuming
fails and system is booted as if no hibernation was used.
I also cannot find any error messages or mentions in the logfiles
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[LENOVO 20KSCTO1WW] hibernate/resume failure
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