Linux, Ubuntu, 18.04, X36CI, NB13, After changing level, run "dmesg", show errors. (FR:100%)

[Felisa-Chen]

Description:
Run 'dmesg -T | grep "error" ' will show some error messages after change level 5 to level 3.

Expected Behavior:
No issue occured after change level.

Severity:
Sev-3
P3
C3
L4

Test Environment:
1. Project: Northbay 13 SKU9
2. BIOS: 0.4.0
3. OS: CI Ubuntu 18.04

Note:
1. VP on all North Bay13 SKU
2. VP on change level 3 to level 5
3. VP on 'shutdown -h now' command

Cross Platform:
N/A

Test case:
[CSV-TC-4575][WIS-TC-4170] Linux_ACPI - Power Cycle Testing step2

Steps to Reproduce:
1. Boot to Ubuntu OS and open Terminal via "Ctrl + Alt + T".
2. Change level 5 to level 3 via "systemctl set-default multi-user.target" command.
3. Reboot to level 3.
4. Run "dmesg -T | grep "error" command will find some error messages.--->Problem(refer to PIC).