This used to happen to me on a Dell laptop, when the laptop would warm up, and the CPU got automatically transferred into a lower C-state.

An extra USB fan I placed under the laptop solved the problem.

You can also manually change the C-state, but I guess the CPU will not like it.

Orna

On Wed, Jul 17, 2024 at 7:10 AM Shlomo Solomon <shlomo.solomon@gmail.com> wrote:

Strange to ask this about Linux (Kubuntu 22.04 with all updates), but:
Occasionally my always on machine starts working VERY slowly.
No strange CPU or memory use in top.
Nothing unusual in logs (maybe I'm not looking in the right places).
Re-boot solves the problem.
As "proof" that there was something wrong, shut-down takes several
minutes!! And the boot then works reasonably fast.
I tried re-booting when there was NOT a problem and then the machine
shut down in a few seconds.

What am I missing?

--
Shlomo Solomon
http://the-solomons.net
Claws Mail 4.0.0 - KDE Plasma 5.24.7 - Kubuntu 22.04
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