On 11/27/23 13:12, Mike Larkin wrote:
On Mon, Nov 27, 2023 at 01:05:56PM -0500, Laurent Cimon wrote:
Hi,
The CPU0 on my Thinkpad 480 is always running at around 100%. It's on
OpenBSD 7.4.
It seems to be doing this in the kernel.
Here is the CPU's line from top(1).
CPU0: 0.0% user, 0.0% nice, 79.3% sys, 3.8% spin, 16.3
It's always this specific CPU, and it's been draining my battery.
How do I find what causes this?
I think that it starts doing it after waking from sleep, as it doesn't do it
when the system is freshly started.
But I'd need to do some tests before verifying this.
Laurent
Please search the list, this has been reported and solved many times,
specifically for this machine.
I found the solution on the Lenovo forums. It's an ACPI issue with
Thunderbolt, affecting even Linux and older versions of Windows.
The solution is to disable Thunderbolt in the BIOS. Security -> I/O Port
Access.
Laurent
