Bug 203108 - Thinkpad T420s will not boot GPT formatted disks.
Summary: Thinkpad T420s will not boot GPT formatted disks.
Status: New
Alias: None
Product: Base System
Classification: Unclassified
Component: misc (show other bugs)
Version: 10.2-RELEASE
Hardware: amd64 Any
: --- Affects Many People
Assignee: freebsd-bugs (Nobody)
Depends on:
Reported: 2015-09-14 20:02 UTC by LW
Modified: 2018-12-25 18:13 UTC (History)
3 users (show)

See Also:


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Description LW 2015-09-14 20:02:00 UTC
Apparently the issue has been fixed on the Thinkpad T420, but the T420s does not boot a GPT formatted hard disk drive (Root on ZFS).
Comment 1 crest 2015-09-15 10:05:48 UTC
It is a known problem that the X220 and T420 refuse to boot in legacy mode from GPT formatted disks. I suspect that the T420s is affected as well. You can either boot in legacy mode from a MBR + bsdlabel formatted disk or boot in EFI mode with the experimental UFS only EFI bootloader.
Comment 2 Allan Jude freebsd_committer 2015-10-15 19:39:06 UTC
When doing the root-of-zfs install, cycle the partition type option from 'GPT' to 'GPT + LenovoFix' and see if that solves it.

If it does, attach the output of:
kenv | grep smbios

to this ticket, and I'll add your hardware to the blacklist
Comment 3 Kevin Zheng 2018-12-25 18:13:40 UTC
Alternatively, gpart set -a lenovofix on your disk.