Linux high cpu usage - htop shows 90% to 100% cpu usage

Question

I installed a fresh Manjaro Linux on my laptop and it works okay but I noticed high CPU usage when i ran the htop command. One of the cores were constantly busy near 100% and the 2nd one was around 90% (I got 4 cores, the remaining 2 are running normally). The laptop is usable but my battery is draining faster than before.

I already found the solution and posting it below to hopefully help someone who is a Linux beginner like myself.

Answer 1

The solution was to create a systemd service that disables the problematic interrupt and executes automatically every time the system boots.

First I needed to identify the problematic interrupt by running:

$ grep . -r /sys/firmware/acpi/interrupts/

I saw one of them (/gpe11) had this big number while all the others had 0

/sys/firmware/acpi/interrupts/gpe11:  7418350  STS disabled     unmasked

Then I created a service file:

$ cd /etc/systemd/system/
$ sudo touch disableInterrupts.service
$ sudo nano disableInterrupts.service

Then i wrote this inside disableInterrupts.service, pasted the path to the interrupt I found.

[Unit]
Description=Disables Interrupts

[Service]
ExecStart=/usr/bin/bash -c 'echo "disable" > /sys/firmware/acpi/interrupts/gpe11'

[Install]
WantedBy=multi-user.target

Then I enabled the service so it executes automatically when system is booted.

sudo systemctl enable disableInterrupts.service

Rebooted the computer and then run the htop again. CPU usage is normal now.