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
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