[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

Márcio (marciosr10@gmail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |marciosr10@gmail.com

--- Comment #111 from Márcio (marciosr10@gmail.com) ---
(In reply to Mario Limonciello (AMD) from comment #101)
> Those of you that can still reproduce this, does reverting
> https://github.com/torvalds/linux/commit/
> 4dbd11796f3a8eb95647507befc41995458a4023 change anything?  That commit is
> correct so we wouldn't revert it in mainline, but it might give a hint that
> there are multiple timing problems.
> 
> Please give it a solid shake out (at least 10 cycles that you unplug power
> adapter during suspend) before reporting back.

Hi Mario,

I tested reverting commit 4dbd11796f3a on my HP Zbook Firefly G10 with a Ryzen
7 PRO 7840HS, as you suggested.

Result: The problem was resolved. I performed the test cycle more than 10 times
and the CPU frequency scaled normally after every single resume. 

Before the revert, the problem would consistently occur during the test cycle
described below:

1) Laptop in use plugged on HP charger (any power profile)
2) Close lid of laptop
3) Unplug HP charger
4) Wait a few seconds
5) Plug in HP charger
6) Open Laptop - See that the CPU is stuck at 544 Hz.
7) Unplug and plug the charger makes the frequency normal again at a minimum of
1101 Hz but scaling normally.

My system details:
- Model: HP Zbook Firefly 14 inch G10 A (SBKPF,SBKPFV2)
- CPU: AMD Ryzen 7 PRO 7840HS
- BIOS: V82 Ver. 01.09.00
- OS: Fedora Silverblue 42

Thank you for your help.
Márcio

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