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kennuk
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unknown USB device requires more power than the port can provide

HP Recommended
Spectre x360 15
Microsoft Windows 10 (64-bit)

received a pop up warning (Unknown usb device needs more power than the port can provide)

No device installed at the time of the warning. Warning still persists

4 REPLIES 4
The_Fossette
HP Support Agent
HP Support Agent
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Message 2 of 5
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@kennuk,

 

Welcome to the HP Support Community!

 

I assure you I will try my best to get this sorted.

 

In order that I may provide you with an accurate solution, I will need a few more details and I would appreciate if you could, perhaps elaborate on your concern.

 

  • What is the exact model for your computer?
  • Do you have any USB devices connected to the computer?
  • Have you made any software or hardware changes on the computer?
  • Have you performed any troubleshooting steps before posting?

 

Look forward to hearing from you and you have a great day!

 

Take care.

 

Cheers!

The_Fossette
I am an HP Employee

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kennuk
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Thank you for the prompt response. I have had this laptop (HP Spectre X360 ) for only a few weeks. I plugged  usb hub into the USB type c power connector.  i was attempting to use two external usb drives from this hub. I was unsuccess full . I unplugged the hub and itwas only later i got the warning 'device requires more power than can be provided ) This flashing warning persisted even after shutting down and having no devices connected. I am wondering if I connected to the wrong usb port and should have connected to the usb(c) thunderbolt port. 

 

Thank you for your offer of help.

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The_Fossette
HP Support Agent
HP Support Agent
29,155 21,825 1,963 2,168
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@kennuk,

 

This message usually appears when a system uses a certified bus-powered USB hub (hub power and power for all its ports are coming from a single upstream cable from the host). In this case, the system knows (via hub descriptors) that this is a bus-powered hub, and therefore it must have the natural limits of how much power can be theoretically taken from upstream, and delivered to downstream ports.

 

Therefore the bus-powered hubs are allowed to allocate only a fraction of power that is normally available from normal ports (500 or 900 mA) and from self-powered hubs (powered from external AC-DC adapters). To prevent the hub upstream port (host downstream) from overloading, USB has a two-step mechanism.

 

If you wish to show appreciation for my efforts, mark my post as Accept as Solution. Your feedback counts!

 

Cheers!

The_Fossette
I am an HP Employee

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PETER1235
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My note book is EliteBook Folio G1

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