[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

Daniel Mewes (mail@dmewes.com) changed:

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--- Comment #84 from Daniel Mewes (mail@dmewes.com) ---
I've been experiencing the same issue on my HP ZBook Power 11g a (with AMD
Ryzen 9 PRO 8945HS) on both Linux 6.8.12 and also 6.11.0 (with Ubuntu patches).

In particular, the variant of this issue that reproduces reliably for me is:
1. Laptop on AC
2. Suspend
3. While suspended, unplug AC, wait a few seconds
4. While still suspended, reconnect AC
5. Wake up laptop
6. CPU frequency no longer exceeds 544 MHz until I unplug and/or replug AC
again

I've tried your patch Mario that enables the sleep for all CPUs, but I was
still able to reproduce the issue.
However, I then updated it to sleep for 100-200ms (instead of the 10-20) as you
had suggested and I'm no longer seeing the issue.

So it appears that this is a valid workaround until HP fixes their firmware (if
ever). Thanks so much for investigating this Mario and figuring out a fix!

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