# GM45 no-microcode bug mitigations re-added (ThinkPad X200, T400 etc)

DevFeed: [GM45 no-microcode bug mitigations re-added (ThinkPad X200, T400 etc)](<https://devfeed.tech/articles/gm45-no-microcode-bug-mitigations-re-added-thinkpad-x200-t400-etc-32673.md>)

Original publisher: [Read original article](<https://libreboot.org/news/gm45microcode.html>)

Author: Leah Rowe

Published: 2026-09-17T04:32:50.666044Z

Content type: news

Language: en

Sources: [News about Libreboot releases and development](<https://devfeed.tech/sources/news-about-libreboot-releases-and-development.md>)

Topics: [bug](<https://devfeed.tech/topics/bug.md>), [patches](<https://devfeed.tech/topics/patches.md>), [Hardware](<https://devfeed.tech/topics/hardware.md>), [x86](<https://devfeed.tech/topics/x86.md>)

Tags: [bios](<https://devfeed.tech/tags/bios.md>), [bug](<https://devfeed.tech/tags/bug.md>), [canoeboot](<https://devfeed.tech/tags/canoeboot.md>), [coreboot](<https://devfeed.tech/tags/coreboot.md>), [free-software](<https://devfeed.tech/tags/free-software.md>), [hardware](<https://devfeed.tech/tags/hardware.md>), [libre](<https://devfeed.tech/tags/libre.md>), [libreboot](<https://devfeed.tech/tags/libreboot.md>), [opensource](<https://devfeed.tech/tags/opensource.md>), [patches](<https://devfeed.tech/tags/patches.md>), [uefi](<https://devfeed.tech/tags/uefi.md>), [x86](<https://devfeed.tech/tags/x86.md>)

## AI overview

Libreboot restored mitigations for a broken SpeedStep/reboot issue on GM45 hardware, including ThinkPad X200 and T400 systems. The article explains the relationship between these mitigations and Libreboot's default CPU microcode policy, and notes that the change was included in Libreboot 20230423 for all GM45 targets.

## Source excerpt

Article: GM45 no-microcode bug mitigations re-added (ThinkPad X200, T400 etc) Web link: https://libreboot.org/news/gm45microcode.html