Hi everybody,
I am experiencing a weird behavior on my laptop.
I have this irq/9-acpi process constantly using about 70% of one CPU and kworker/0:2-kacpi_notify using another 20% of one CPU.
Here is an excerpt from “top”:
Tasks: 295 total, 2 running, 292 sleep, 1 d-sleep, 0 stopped, 0 zombie
%Cpu(s): 8,5 us, 26,2 sy, 2,1 ni, 46,9 id, 16,0 wa, 0,0 hi, 0,3 si, 0,0 st
MiB Mem : 15870,98+total, 396,477 free, 6388,324 used, 10405,18+buff/cache
MiB Swap: 15863,99+total, 15861,74+free, 2,250 used. 9482,660 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
57 root -51 0 0 0 0 R 70,44 0,000 15:39.66 irq/9-acpi
60 root 20 0 0 0 0 I 20,93 0,000 2:07.88 kworker/0:2-kacpi_notify
Laptop is an HP Elitebook which has always worked well.
After a bit of tweaking, I understood the reason ot this weird behavior: I was using an external monitor connected via USB-C to the laptop.
As soon as I disconnect the external monitor, CPU usage is back to normal.
I normally use HDMI, so I never noticed this behavior.
Have you ever noticed this behavior?
How can I fix the high CPU usage?
Thank you in advance
Cris