[Bug 221065] ideapad_acpi: unexpected charge_types spam on Yoga Pro 7 14ASP9

bugzilla-daemon
2026-02-11T15:02:08Z

--- Comment #23 from Avraham Hollander (anhollander516@gmail.com) ---
(In reply to Rong Zhang from comment #22)
> +CC Mark Pearson.
>
> Thanks for Armin's insight!
>
> Yeah, the root cause should lie in the ACPI table. It's super broken as I
> even found more ECMT issues...
>
> I've noticed these methods are broken while glancing at all occurrences of
> ECMT in DSDT: WTER, ECCC, _BTP.

Speaking of firmware-related issues, TSC is broken on my laptop, causing
reliance on HPET as clocksource and increased scheduling latency. Unless I have
no idea what I'm talking about, I think it's a BIOS issue as well. I made a
post on the Lenovo Linux forum about it that I'll post here for visibility:
https://forums.lenovo.com/t5/Other-Linux-Discussions/1-second-TSC-warp-on-IdeaPad-5-2-in-1-14AHP9-due-to-bad-initialization-in-BIOS-forces-HPET-fallback/m-p/10021248