What is D0 on laptop usb?
I followed an online guide to find out how many amps my laptop's USB port had, but it only said D0. What does that mean?
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These are information about the device-specific power state. D0 merely states that the power state is completely “a” (and does not remain in any energy saving mode).
https://learn.microsoft.com/de-de/windows-hardware/drivers/kernel/device-power-states
It doesn’t say anything about the performance you can pull.
What do you want to know?
What USB standards your Lappi has?
How much power you can draw at maximum on your laptop at the USB port?