microcode-20200609 release, intel-ucode 06-8e-0c/0x806ec revision=0xd6 causes freezes on warm boot

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Issue 类型
缺陷
描述清晰度
需要澄清
活跃度
停滞
技术栈
linux
领域
operating-systems

调研方向

首先检查 Debian bug 962757、Ubuntu bug 1883002 和 issue #24，然后比较 revision 0xca 与 0xd6 之间报告的系统和 warm-reboot 行为。完成的标准是确定 revision 20200609 是否会导致冻结，并清晰记录受影响的处理器系统和证据，达到足以指导 release 决策的程度。

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描述

Per debian bug 962757, ubuntu bug 1883002, and from internal testing, some systems are seeing freezes, particularly after warm reboots, with the 06-8e-0c/0x806ec revision 0xd6 from the 20200609 microcode release.

microcode: microcode updated early to revision 0xd6, date = 2020-04-23
microcode: sig=0x806ec, pf=0x80, revision=0xd6

The systems from the collected reports are:

Dell Latitude 7400, i5-8265U (debian bug)
Dell Latitude 7300, i7-8665U (ubuntu bug)
Dell Latitude 5410, i5-8365U

Specifically, the reporter from ubuntu bug report inidats that they were initially affected by the similar issue against 0xca as reported in #24; a BIOS update from Dell addressed that, but it was re-introduced with the 20200609 update that moved from 0xca to 0xd6. That users testing also indicated a much higher frequency of freezes occurring with warm reboots (the freeze seen with the third system was also after a warm reboot). The debian bug reported that their system was also stable with the 0xca version but not the 0xd6 version.

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