Comment 695 for bug 1690085

(In reply to onox from comment #607)

To prevent misunderstandings, let me repeat what I previously wrote, from a different angle: ASRock X370 Taichi firmware version v5.50 is worse than previous versions in that it removes the "Power Supply Idle Control" option off the configuration screen. As a result, with Linux 4.18 (Ubuntu kernel 4.18.0-20-generic) and below the system *will* lockup unless different counter measures are taken (namely set the MSR).

This said, I have been and am running this single system 24/7 without issues despite extended low load periods on Ubuntu 18.04 LTS kernel 5.0.0-15-generic with microcode level 0x08001137 since May 15 (and from May 11 to May 15 on mainline Linux 5.1.2 with the same microcode) with AsRocks' firmware configuration defaults and without setting the MSR.

Summing up, the latest ASRock firmware for this mainboard takes a step in the wrong direction for Linux users, however newer Linux versions prevent this system from locking up.

MCExtractor is aware of a newer microcode, 0x08001138 (seen on 2019-02-04) for CPUID 0x00800f11, which ASRock decided not to include in their firmware.