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

bugzilla-daemon
2026-02-10T21:20:38Z

--- Comment #14 from Armin Wolf (W_Armin@gmx.de) ---
I think that the ACPI errors you shown us are somehow connected to this
problem, which has something to do with a shared memory area called SMA2 is
protected by the ECMT mutex

Both the usci driver and ideapad_acpi call ACPI methods that want to access
SMA2 and thus attempt to acquire the ECMT mutex. usci times out after ~2
seconds when attempting to acquire said mutex, but tries to release it anyway
due to a firmware bug, leading to the above errors. ideapad_laptop also likely
times out when acquiring the mutex, returning a bitmask with all bits set as a
result. ideapad_laptop now sees that all bits are set at the same time and
rightfully complains