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EliteBook X360 1040 G6 powers USB port when off even when disabled in BIOS

HP Recommended
EliteBook X360 1040 G6
Microsoft Windows 10 (64-bit)

My question is basically the same as in EliteBook 8470p shutting off charging from USB charging port , but for a different device.

 

I shutdown the device, plug off the power supply of my docking (thunderbolt), and the network port is still blinking.

Even when I plug the docking station when the notebook is off, it gets power from the notebook.

 

I think I found the option in the BIOS setup and disabled it, but it doesn't change anything.

 

20210305_195319.jpg

In case the photo is not visible: The option I disabled is "USB Legacy Port Charging"

 

 

After a weekend with my notebook turned off on the docking without external power supply, the battery is so low that it shows a battery warning after logging in.

Did I miss anything to disable this USB power when off?

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