There were several bugs in the AMD microcode loader, which were fixed
(AFAIK, anyway) on later kernel stable updates from kernel.org. They
could easily explain the boot failure with the low-latency kernel.
I am not sure if these fixes were incorporated on Ubuntu's 15.10 kernel
updates or not. I am also not sure if the low-latency kernel changes to
fundamental kernel structures is compatible with the early AMD microcode
loader or not.
Is anyone still affected by this bug on *up-to-date* Ubuntu 15.10 with
the normal kernel? With an up-to-date low-latency kernel?
** Changed in: amd64-microcode (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1450188
Title:
Intermittent boot issues if the proprietary amd64-microcode package is
installed on Ubuntu 15.04
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