Enabling Wi-Fi (Realtek RTL8821AE) on ASUS X441URK will lag & freeze the screen, use more than 90% of CPU for /usr/lib/systemd/systemd-journald, PCIe Bus Error on restart & shut down

[son]

Solution: I used pcie_aspm=off in the end, pci=nomsi or pci=noaer solves the issue too.

@filo

I would not dislike trying the kernel boot parameter pci=nomsi, at the very least, if you notice improvements, keep the system under control for a while.

@tbg

Add the GRUB kernel boot parameter pci=nomsi to /etc/default/grub:

sudo cp /etc/default/grub /etc/default/grub.bak && sudo sed '/^GRUB_CMDLINE_LINUX_DEFAULT=/s/"$/ pci=nomsi"/g' -i /etc/default/grub

After adding the boot parameter, run:

sudo update-grub 

Then reboot and test your CPU usage…

If the change does not improve your issue, you can restore the grub file to its original state with:

sudo cp /etc/default/grub.bak /etc/default/grub

Then, run:

sudo update-grub 

Then reboot.

Thank you to everyone that helped.