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Usb port when i turn my laptop off the usb ports still have power on them

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Re: usb port

Probably from the battery if the PC is in hibernation or stand by mode.

Posted on Jan 05, 2008

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How do I increase the power to the USB ports on a multimedia keyboard with 2 USB 2.0 ports?

What JonSnell says is true. When an USB port on a computer can deliver 5 volt, it is limited to 500 mA or 0,5A. Not every port on every computer will be able to deliver power. It is dependent on how the manufacturer has made the computer. When a Laptop with 4 USB ports, will be used to charge your equipment it should drain 2 A and would empty the battery very quick. So better not try to use a laptop for that.
A driver is meant, for the computer to make it possible to communicate with the hardware you connect. Communication is one thing, completely separated from the possible power a port can deliver.
There will be no driver, that can change the maximum output on the USB port, because the computer hardware will limit it on the 500 mA. Even on a desktop PC. So most modern smart phones or tablets need more power than a PC can deliver.
To charge them, you better use a charger, or if you want to sync and charge the battery in the same time, buy a USB hub with an external power supply. Be aware, most power supplies only can deliver 2 A, so don't put more devices to charge then the 2 ampere the power supply can deliver, or you will get the same message.

Feb 23, 2015 | Dell PC Laptops

1 Answer

Acidentally plug in earphone jack on usb port

The USB ports are very well protected and I don't expect that is the cause of win7 crashing. Plug a USB device into a USB port and if the laptop recognizes it, the port is OK.

Nov 19, 2013 | ASUS PC Laptops

1 Answer

I am trying to upload pictures from my razer phone to my dell latitude d410 laptop and when I plug into to the usb port I get a message saying power surge on hub port...a usb device device has...

Using a different USB port might solve the problem, turn the phone off completely and plug the phone in after doing so turn the phone on if the same problem persists then contact the phone manufacturer and ask if its a common fault

Jun 27, 2011 | PC Laptops

1 Answer

A USB device has exceeded the power limits of its hub port

If you get an error message"Insufficient power to operate USB device" when you plug a USB deviceinto the computer's USB port, then this device is drawing excessive currentthat the USB port cannot supply. In case such as this, youneed to purchased a powered USB hub and connect this hub into the computer'sUSB port and then connect the USB device into this powered USB hub.

Mar 11, 2011 | HP Compaq nx6110 PC Laptop

1 Answer

I have a Logitech cooling pad for my Dell 17" Studio laptop with 4 GB RAM and Vista Home Premium. It mysteriously stopped working. When I plug the cooling pad in other laptops, it works fine. I have...

Seems that your laptop's USB ports are not providing enough power to the cooling pad. This could be due to you connecting too many USB peripherals to your laptop. Test if you can get the cooling pad to work by disconnecting all other USB devices.
As a permanent fix, you can buy an active USB hub (one powered by external power source) & connect your cooling pad to it.

Dec 18, 2010 | PC Laptops

1 Answer

My both usb ports r not wrking n hangs when eithr card reader or pen drive is inserted bt works well when tata photon usb port or mouse port or key board port is inserted ?model- EMACHINES E275

Sounds like your laptop's USB ports are not capable of providing enough power to operate your card reader or pen drive. I suggest you buy an active USB hub (one with external power source, rather than the one which draws power from the laptop's USB port), & attach your card reader and/or pen drive to that USB hub.

Nov 28, 2010 | Acer PC Laptops

1 Answer

USB Port not working

If you are running Windows XP or Vista, here is a "magic fix" that seems to work. (I have NO idea why it works, but it has on many occasions restored the USB ports on three different computers.
Turn off the laptop. Remove the power cord AND the battery. Press the start button and hold for 5 seconds. Replace the battery back into the laptop, and reconnect the power cord if desired, and turn it back on. See if the USB ports work now. Post or comment back with the results.

Jul 19, 2009 | PC Laptops

1 Answer

Hp pavilion dv4000 usb port can't use

This error occures when a USB device draws more power than the USB port can supply.
To fix this problem, purchase a powered USB hub. Power up the hub and connect it to the laptop's USB port and then plug the USB device into the powered USB hub.

May 05, 2009 | HP Pavilion dv4000 Notebook

1 Answer

My mobile won't charge from USB port

in your laptop goto device manager. universal serial bus controller. go to appropriate port. Right click- properties - there you will c a power management tab. uncheck Allow the computer to turn off this device to save power. click ok.

Jan 19, 2009 | Toshiba Satellite U405-S2826 Laptop

2 Answers

External hard drive

There is no enough power in you USB port. I was have similar problem with my old PC (Duron 1.3GHz, I don't know what motherboard).

When I conected HDD (My passport Essential) to USB (there is only USB 1.1 port on this MB, and probably if you have USB 2.0 you will have no problem), hardware wizard is started, looking for drivers (which are not needed to install portable HDD), and then I have message like "unrecognized USB device ...".

SOLUTION: On this MB there is 6 USB 1.1 ports, but only 2 are connected on case (with plugs on case outside), others are on MB and if you have cable you can use it. In my BIOS all 6 were turned on, and I think there must be a problem with power on chip (you have some power divided with 6 ports, and this is not enough for HDD).

I turned off my other USB ports in BIOS, and left only fist two, and HDD is now in my computer ....

May 26, 2008 | Dell Inspiron 5160 Notebook

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