I’m encountering an issue with my ASUS B550A motherboard where the system reboots automatically after I shut it down from Ubuntu. Through troubleshooting, I’ve identified that this seems to be related to the Wake on LAN feature. Here’s a detailed overview of the issue and the steps I’ve taken so far:
System Setup:
- Motherboard: ASUS B550A
- BIOS Version: 3607
- Processor: AMD Ryzen 7 5800X
- Graphics Card: NVIDIA GeForce GTX 1080 Ti
- Memory: 32 GB
- OS: Ubuntu 22.04.5 LTS (tested on a standalone HDD with no other drives connected)
- Network Adapter: Intel I225-V
Issue Description:
When shutting down from Ubuntu, the system powers off briefly but then reboots instead of staying powered off. I’ve discovered that disabling “Wake on PCIE” in the BIOS stops the reboots, and the system remains off as expected. However, I rely on Wake on LAN functionality, so disabling Wake on PCIE isn’t a viable long-term solution.
Troubleshooting Steps Taken:
- Wake on PCIE: Disabling this option prevents the reboot issue, but this also disables Wake on LAN, which I need.
- The BIOS is set to stay off after power failure. (It does not fix the issue, also I would like to make sure it turns on after power failure)
- Configured Wake on LAN in Ubuntu using ethtool to allow wake only on magic packets (wol g).
- Verified settings in /proc/acpi/wakeup and ensured that only necessary wake functions are enabled.
- Updated the motherboard BIOS to version 3607.
- Tested shutdown with and without an Ethernet cable connected (issue persists with the cable disconnected).
- Checked system logs for shutdown and wake events, but no clear indication of what’s triggering the reboot.
I have also tested this on Windows, and the shutdown works correctly there without the system rebooting. This issue only occurs when shutting down from Ubuntu.
Despite these steps, the system continues to reboot after shutdown from Ubuntu unless I disable Wake on PCIE, which isn’t ideal.
Could there be a firmware or compatibility issue with Wake on LAN settings on the B550A when using Linux-based systems? I’d appreciate any guidance on further steps or BIOS settings adjustments to resolve this while keeping Wake on LAN functionality enabled.
