Can you see if the 4.15-rc6 kernel has the same issue:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc6
** Changed in: linux (Ubuntu)
Importance: Undecided => High
** Changed in: linux (Ubuntu)
Status: Incomplete => Triaged
** Tags added: kernel-da-key
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https://bugs.launchpad.net/bugs/1741167
Title:
Mainline kernel 4.14.11 not booting on Lenovo X220
Status in linux package in Ubuntu:
Triaged
Bug description:
With Ubuntu 16.04.3 LTS (Xenial Xerus), Ubuntu mainline kernel 4.14.10
or 4.14.11 for arch i386 does not boot on Lenovo Thinkpad X220. After
GRUB message 'loading initrd' screen is cleared and machine restarts
BIOS. Nothing is written to screen or system log.
Mainline kernels up to 4.14.9 for arch i386 works fine.
Booting same machine with mainline kernel 4.14.11 for arch amd64 works
fine.
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