[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 #148 from Gergo K (soyer@irl.hu) ---
Thank you guys!

> Note that CPU was *not* throttled while I took this dump, it was running
> normally.

This is not a problem, it does not contain any running state, it would return
the same.

> The previous one (worked perfectly): 01.10.00 Rev.A, dated Aug 18, 2025

If you ever revert to the old BIOS version, please send us an acpidump so we
can get closer to a solution.

What I noticed is that they are implementing both AMD and Microsoft's LPS0 DSM.

The code would be prepared to use only one of them, but I think a bug was added
with a change that makes it use both. And maybe the laptop isn't prepared for
this.

/drivers/acpi/x86/s2idle.c:462:
} else if (lps0_dsm_func_mask_microsoft > 0 && rev_id) {
        lps0_dsm_func_mask_microsoft = -EINVAL;
        acpi_handle_debug(adev->handle, "_DSM Using AMD method\n");
}
but the rev_id is always 0 here, so both lps0_dsm_func_mask,
lps0_dsm_func_mask_microsoft will be active.

Would removing " && rev_id" from the if solve the problem?

Mario what do you think?

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