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LIN8-4962 : x86/pm: Introduce quirk framework to save/restore extra MSR registers around suspend/resume

Created: Oct 25, 2016    Updated: Dec 3, 2018
Resolved Date: Oct 26, 2016
Found In Version:
Fix Version:
Severity: Standard
Applicable for: Wind River Linux 8
Component/s: Kernel


A bug was reported that on certain Broadwell platforms, after resuming from S3,
the CPU is running at an anomalously low speed.

It turns out that the BIOS has modified the value of the THERM_CONTROL register
during S3, and changed it from 0 to 0x10, thus enabled clock modulation(bit4),
but with undefined CPU Duty Cycle(bit1:3) - which causes the problem.

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