https://bugzilla.kernel.org/show_bug.cgi?id=218557
Bug ID: 218557
Summary: Kernel regression in acpi/ec.c causing some AMD
platforms to limit CPU frequency to < 544Mhz
Product: ACPI
Version: 2.5
Hardware: AMD
OS: Linux
Status: NEW
Severity: blocking
Priority: P3
Component: EC
Assignee: acpi...@kernel-bugs.osdl.org
Reporter: mpearson-len...@squebb.ca
Regression: No
Created attachment 305960
--> https://bugzilla.kernel.org/attachment.cgi?id=305960&action=edit
Log of system after suspend/resume with frequencies locked
There have been various reports of issues on Lenovo P15v G3 AMD and P16v G1 AMD
platforms where CPU frequency after suspend/resume is limited to 544MHz
I was able to reproduce this reliably on my P16V G1 AMD with the following
steps:
- Be plugged in
- Suspend (s0ix)
- Unplug
- Resume
If then checking the CPU frequencies they are limited to 400 to 544Mhz and
cause reduced system performance. The only recovery is to power cycle.
I was able to bisect the issue and tracked it down to this commit:
https://github.com/torvalds/linux/commit/b5539eb5ee70257520e40bb636a295217c329a50
I've done a 6.8-rc6 build with and without this change and confirmed it is
broken/fixed (kernel logs attached).
Please let me know how to proceed from here.
Thanks
Mark
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