Question+5VSB won't stay on
Question+5VSB won't stay on
I'm attempting to configure a server PC with WoL activated. I'm using Ubuntu Server on a Ryzen 7 3700X running in a biostar X370GTN (latest BIOS) that supports WoL. In the BIOS I've set WoL and ErP as disabled, but whenever the system powers down or enters sleep mode, +5VSB disappears completely from the port, causing it to stop lighting up and WoL to fail. I've followed the correct setup in Ubuntu, yet nothing remains stable. What's happening? How can I resolve this issue?
PSU: Specify make, model, wattage, age, condition (original to build, new, refurbished, used)?
Power down, unplug, open the case.
Search for loose connectors.
Do you have a multimeter and understand how to use it? Or do you know someone who does?
https://www.lifewire.com/how-to-manually...er-2626158
If not, consider replacing it with a known working PSU.
Ensure you only use the cables provided for the new PSU.
I've been assembling the entire setup for Facebook marketplace and similar systems. I attempted to install it outside the case before placing it inside, so it doesn't appear in the case at all—though I'm not sure why that matters. The PSU is a used Corsair CX550M, appearing to be in good shape and functioning properly; the PC runs smoothly with everything connected. I verified its output voltage using a multimeter, and all readings, including the 5VSB pin, match expectations. The only cables present are the motherboard, CPU, and GPU, all securely plugged in.
This was once a straightforward setup before Microsoft made adjustments and altered related configurations, especially concerning WOL. Even then, the BIOS needed modifications to support these proprietary methods of activating machines.
It seems there must be a specific BIOS setting enabling this functionality. WoL might function even when activated, but it tends to be unreliable. We often had to repeatedly send the WoL command through test servers to achieve success.
A more reliable approach involved using the rack-mounted power controller to restart the machines and then leveraging the BIOS power restore option. The exact terminology differs, but most BIOS versions support booting when power is restored.
Fortunately, modern affordable power plugs exist that can be controlled remotely via a network. These also address the common concern about waking a machine from outside the house using standard WoL methods.
But once more, it seems necessary to find a specific configuration within the BIOS that enables this functionality.
Regarding Microsoft, aspects such as power efficiency, network WoLs, etc., I recommend examining closely what processes are active or inactive on the system.
I explored +5VSB and conducted some research:
+5VSB is a backup voltage source that activates when AC power reaches the system’s power supply. It keeps circuits running even when the main DC outputs (+12VDC, +5VDC, +3.3VDC) are turned off. Possible applications include soft power control, Wake on LAN, wake-on-modem, intrusion detection, or sleep modes. The current drawn from this output varies with the system’s power supply design.
Source: Intel BTX Interface
The BIOS configurations remain unchanged after resets, which suggests the CMOS battery is likely intact. I attempted to reset the CMOS and then reinstalled it; afterward, the board's LED indicators activated and the RAM lights came on, confirming full functionality for +5VSB. I explored adjusting numerous BIOS settings—such as network stack options, CSM combinations, and various ROMs—but none resolved the issue. I also followed official Windows installation steps from Biostars. On Ubuntu, I experimented with register modifications using the setpci command, though I’m unsure if it helped. In Linux, a command revealed the NIC registers didn’t update properly, indicating a possible limitation in my understanding of the process.