[Bug 218305] Ryzen 7 7840HS gets stuck at 544MHz frequency after resuming after unplugging the power cord during sleep

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218305

--- Comment #144 from Luke McCarthy (mail@lukehmcc.com) ---
From HP Support:

Issue Reported : experiences a critical firmware-level bug when running Linux:

Thank you again for helping confirm the behavior we’ve been investigating.

At this time, there is no permanent fix available.

We have identified a confirmed trigger: the issue occurs when the AC adapter is
unplugged or reconnected while the laptop is in suspend mode, causing the CPU
to become limited to approximately 443 MHz after wake.

Temporary Workaround:
Please advise users to avoid changing the AC power state while the system is
sleeping.
If the system does enter the reduced 443 MHz state, performing a full system
reboot will restore normal CPU performance.

I am escalating this to our L2 firmware/ACPI team for deeper investigation. I
will provide an update as soon as we receive their findings.

To strengthen the escalation, could you please share the total install base for
the affected model(s) within your fleet? This information will help us
prioritize and push for an urgent resolution.

...

Good they are at least aware now. Will keep updated.

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