What setting do you have for USB S4/S5 Power (this is in the Secondary Power Settings under the Power tab)? If this is enabled (to allow USB devices (keyboard/mouse) to wake system from S4 or S5), then the ports are going to be powered if the system is plugged in to the wall...
The USB S4/S5 Power in Secondary Power Settings is NOT checked.
Its really strange, after shutting down the system, the power of the USB port ist switched off.
But after powerng the NUC the USB power ist on...
Ah, I understand now. The BIOS is doing exactly what it is supposed to do be doing. It is what happens BEFORE the BIOS ever has a chance to run that is the problem. I am not sure what to suggest here. I will send a message to the development team and see what they have to say...
Okay, that sounds good, thank you !
Hope there is a solution for it.
Here are some more details: The NUC is behind a power switch and a LED is connected to the USB Port power pins to show if the CPU is running. (But now it shows the cpu running at power on)
Yes, there is a LED in the power switch ON the NUC, but it is not visible at the mounting position. And at last he NUC has to be controlled by remote control.
i just updated the bios version to 0355, but unfortunately the problem is the same as before.
Plugging in the 19V power without starting the NUC directly supports USB ports with 5V.
After a Startup - Shutdown process of the NUC the USB power is off.
It would be very nice if the USB power stays off after first time the NUC gets the 19V power.
Do you see a way to do so ?
if you mean CPU is running when you say: NUC is on, then you are absolutely right.
After plugging in the NUC power supply, there should be no power at the USB ports (it is enough if there is no power on the front USB ports).
It is possible to keep USB ports off when the NUC is off changing the BIOS as follow:
1)Go to BIOS>Advanced>Devices>Change portable device Charging Mode option to Off
2)BIOS>Power>Secondary Power Settings> USB S4/S5 Power option, change it to uncheck
Let me know how it works
it's all set like you wrote.
But this doen't change anything.
The same behavior like before, only conntecting the NUC to power will switch the USB power on, without starting the bios.
After shutdown from operating system, once the NUC (bios and operating system) was started, the USB power is switched off (equal to the settings of the bios).
I regret the inconvenience.
Please get in touch with our support team and request a NUC replacement.
I'm sorry for the delay.
I don't think that there is a hardware problem with the NUC, because in the last days i tested the same with 2 other NUC's.
One NUC5i5RYH , the same i have and one D34010WYK, both of them shows the same behavior.
It looks like the NUC's always provided the USB ports with power when the NUC is plugged to power at the first time.
So I think there will be no solution for this problem.
It would be nice if someone could test it on real hardware:
( bios settings should be:
BIOS>Advanced>Devices>Change portable device Charging Mode option to Off
BIOS>Power>Secondary Power Settings> USB S4/S5 Power option, change it to uncheck
1. unplug NUC from power
2. attach a usb (stick or harddisk) with a LED
3. plug in the NUC power (Do not start the NUC)
-> The usb stick/harddisk LED should be on
4. Start the NUC to operation system (use the ON switch)
5. shutdown the NUC
-> the usb stick/harddisk LED should be off
6. unplug NUC from Power and wait a moment
7. plug NUC to power
-> The usb stick/harddisk LED should be on
I did the test using the NUC kits 5i5RYK and 6i3SYH without any issue. I noted with few external devices, the LED light turn on for a very little period then shutdown. The capacitors of the NUC keep some charge.
after your last answer I test different USB devices too, they all shows different behavior.
1. external 2,5" REVOLTEC hard disk
2. DataTraveler USB Stick
3. Kingston USB Stick
4. Noname USB Stick
5. USB Connector with LED between USB +5V and USB Gnd
after plug to power
(1) Harddisk LED ON
(2),(3) LED OFF
(4) LED ON for a littel period ~0,5s
(5) LED ON
Just (5) shows me that the USB power is always ON after plugging in the power because the LEDs on USB Stick and hard disk are controlled by their USB Chip. Some of them switch the LED on some of them not.
So the only real test is too measure the voltage between the outer USB port pins with a voltmeter.
Apologize my stubbornness