High CPU from kworker kacpi_notify

High CPU from kworker/0:x-kacpi_notify

Ubuntu 20.04 LTS

Update: this problem is fixed after I did "apt dist-upgrade" on 9/21/2020
Update again: Acutally not fixed. It happened again after unplug/plug the usb-c hub.

I recently got a USB-C Hub (Targus ACA958USZ). When it's plugged in, the laptop gives high cpu from process
I've found a few USB-C hubs from various manufactures with the same problem. I think they are of the same chipset.

1071993 root      20   0       0      0      0 I  11.6   0.0   0:10.20 kworker/0:2-kacpi_notify  

Reference:
https://superuser.com/questions/1477106/acpi-interrupts-causes-high-cpu-usage-from-kworker

$ grep . -r /sys/firmware/acpi/interrupts | grep -v "  0"
/sys/firmware/acpi/interrupts/sci:30750706
/sys/firmware/acpi/interrupts/gpe6E:   89394  EN     enabled      unmasked
/sys/firmware/acpi/interrupts/gpe69:30662925  EN STS enabled      unmasked
/sys/firmware/acpi/interrupts/gpe30:      32  EN     enabled      unmasked
/sys/firmware/acpi/interrupts/gpe_all:30752375
/sys/firmware/acpi/interrupts/sci_not:      12
/sys/firmware/acpi/interrupts/gpe6F:       1  EN     enabled      unmasked
/sys/firmware/acpi/interrupts/gpe6D:       5  EN     enabled      unmasked
/sys/firmware/acpi/interrupts/gpe61:      17  EN     enabled      unmasked

Need disable interrupt gpe69

Run as root:

$ echo "disable" > /sys/firmware/acpi/interrupts/gpe69

it works! thank you!

my case

$ grep . -r /sys/firmware/acpi/interrupts | grep -v "  0"
/sys/firmware/acpi/interrupts/sci:14580082
/sys/firmware/acpi/interrupts/gpe69:14579841     STS enabled      unmasked
/sys/firmware/acpi/interrupts/gpe0C:       2  EN     enabled      unmasked
/sys/firmware/acpi/interrupts/gpe_all:14580088
/sys/firmware/acpi/interrupts/sci_not:       1
/sys/firmware/acpi/interrupts/gpe43:     241  EN     enabled      unmasked
/sys/firmware/acpi/interrupts/gpe6D:       4  EN     enabled      unmasked

$ sudo su
[sudo] password for ***: 

$ echo "disable" > /sys/firmware/acpi/interrupts/gpe69

The above method doesn't work if the usb-c device is unplugged and plug in again or when machine is restarted. A permanent way to solve this is to add acpi mask during boot up by updating GRUB:

GRUB_CMDLINE_LINUX_DEFAULT="acpi_mask_gpe=0x69 quiet splash"

Specific instruction:
Add acpi_mask_gpe=0x69 to /etc/default/grub line GRUB_CMDLINE_LINUX_DEFAULT, then run update-grub and reboot.

Reference:
[1] https://askubuntu.com/questions/1275749/acpi-event-69-made-my-system-unusable
[2] https://askubuntu.com/questions/1029745/ubuntu-18-04-w-macbook-pro-kworker-keeps-hogging-up-my-cpu

echo "disable" > /sys/firmware/acpi/interrupts/gpe69 worked like a charm. I'm on Ubuntu 23.04