Ultra USB Power ports causing issues with shutdown

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   Hi, bit of a weird one.
Just got a new PC with the Asrock X870 Riptide WiFi motherboard.
I use several external harddrives that are connected to a powered USB hub. The issue is as follows:
- if I connect the powered USB hub to one of the 2 ports that are labelled as "Ultra USB Power" adnd then turn off my PC, within a second of turning off all the case fans start spinning again, at max spee. All the other RGB and fans (e.g. CPU or GPU fans) are off, it's just the case fans that start spinning.
- if I connect the powered USB hub to a different usb port, one that is NOT labelled "Ultra USB Power", everything is as expected - I turn the PC off and no fans are spinning, the PC is "truly" off.
I'm sure it's related to the "Ultra USB Power" port because
- if the issue is happening (i.e. powered USB hub is connected to the "Ultra USB Power" port, PC is off, fans are spinning) and I then unplug the powered USB hub, the fans stop spinning. If a moment later I plug the powered USB hub in again, the fans start to spin (while the computer is off the whole time).
- turning the PSU off, and even unplugging the power cable, doesn't stop the fans from spinning if the powered USB hub is plugged in.

What is going on? Is there a setting I can turn on/off to disable this behaviour?

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amerkiller Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 26 Jan 2025 Status: Offline Points: 50	Post Options Post Reply Quote amerkiller Report Post Thanks(0) Quote Reply Topic: Ultra USB Power ports causing issues with shutdown Posted: 26 Jan 2025 at 12:16pm
	Hi, bit of a weird one. Just got a new PC with the Asrock X870 Riptide WiFi motherboard. I use several external harddrives that are connected to a powered USB hub. The issue is as follows: - if I connect the powered USB hub to one of the 2 ports that are labelled as "Ultra USB Power" adnd then turn off my PC, within a second of turning off all the case fans start spinning again, at max spee. All the other RGB and fans (e.g. CPU or GPU fans) are off, it's just the case fans that start spinning. - if I connect the powered USB hub to a different usb port, one that is NOT labelled "Ultra USB Power", everything is as expected - I turn the PC off and no fans are spinning, the PC is "truly" off. I'm sure it's related to the "Ultra USB Power" port because - if the issue is happening (i.e. powered USB hub is connected to the "Ultra USB Power" port, PC is off, fans are spinning) and I then unplug the powered USB hub, the fans stop spinning. If a moment later I plug the powered USB hub in again, the fans start to spin (while the computer is off the whole time). - turning the PSU off, and even unplugging the power cable, doesn't stop the fans from spinning if the powered USB hub is plugged in. What is going on? Is there a setting I can turn on/off to disable this behaviour?

amerkiller Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 26 Jan 2025 Status: Offline Points: 50	Post Options Post Reply Quote amerkiller Report Post Thanks(0) Quote Reply Posted: 26 Jan 2025 at 12:18pm
	Forgot to say, I did try resetting and updating the BIOS, nothing has changed.

amerkiller Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 26 Jan 2025 Status: Offline Points: 50	Post Options Post Reply Quote amerkiller Report Post Thanks(0) Quote Reply Posted: 9 hours 34 minutes ago at 10:20am
	Seems like this forum is dead, or ASRock doesn't care about it. If you want to see how the conclusion below was reached, I made a thread in https://forums.tomshardware.com/threads/ultra-usb-power-ports-causing-fans-to-spin-after-shutdown.3871755/ As for the conclusion: It looks like it's those "fancy" ports ("Ultra USB power") that are causing the issue. The USB-A (female) to USB-C (male) adapter that I ordered arrived and when attaching the powered USB hub via this adapter to the USB 4.0 port on the motherboard, the fans no longer spin up when the computer is off, meaning that backfeeding is no longer happening, or is somehow getting blocked. In retrospect I guess I should've gone with a different motherboard but you can't predict everything. Definitely unhappy about this stupid tech that ASRock implemented, this downside is annoying and definitely much more common for people than some unstable 5V or whatever problem those fancy "Ultra USB power" ports are trying to solve.