[Q] Windows 7 USB charging, only 100mA?

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Is there a special driver from Samsung or a hack that will enable the full 500mA per USB port on Win7? I checked the USB hub power settings and see the Vibrant only pulling 100mA. On XP it wasn't so bad. I'm almost desperate enough to try the Motorola drivers.

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http://forum.xda-developers.com/showthread.php?t=728929

Originally Posted by bchalk

http://forum.xda-developers.com/showthread.php?t=728929

Thanks, I'll try that. Hope it works.

I tried the drivers from the suggested thread and they didn't make any difference. They were already installed in my PC from the Samsung Kies installation.

Does anyone else have a suggestion how to make the PC USB ports in Windows 7 driver the full 500mA current?

Bumpity bump. I also would like to know why Win7 is only giving 100 mA (96, actually) to my phone. I'll have to check my XP station at work tomorrow as well.

I just checked my spare laptop that's still running vista, and Device Manager says the port is capable of 500 mA but the device is only drawing 96 mA. Possibly the charger on the battery is limiting the current?

The possibility of a hardware limiter in the phone is one of a few. Usb's of course max out a hub at 500mA. So if you have anything else plugged into the hub it'll split the charge. Assuming usb 2.0, I'm not sure if 3.0 increases allowed draw. It could also be a limitiation of the PSU itself. If you have a smaller psu and enough crap already leeching it, it will prevent additional draw.

The capabilities reported in Device Manager are not necessarily accurate.

Depending on your hardware, some ports may be limited to 100mA while others can do the full 500mA. This is especially common on laptops. If you have USB ports in different locations, try a port from each set.

For example, on my Lenovo I have one high speed port on the left that can do 500mA, while the two slower ports on the right can only do 100mA. (In this specific case, the faster port is actually designed to do double-duty as Firewire with the proper adapter.)

One of my desktop machines in my AV closet has three sets of USB ports and only those on the front panel will do 500mA, although they're all high speed, and they all report 500mA in Device Manager.

It just depends on your hardware. I wouldn't be surprised to hear there are some machines that don't have any 500mA ports.

Same problem with Captivate

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I just got a Captivate, and seeing same problem with Windows XP. However, when I plug in a blackberry using same cable same port, Device manager is showing blackberry is pulling 500mA instead of 96mA. One Caveat: I can't install samsung driver since this is work machine. But my old (dumb) LG v8550 was pulling 500mA from USB port without a driver.

Hello community,

The XP desktop at work is also pushing 96mA to my Galaxy S. I do not want to (and I am not allowed to) install any drivers since it is a company workstation.

I am currently using the USB data cable from my old Nokia, I will test tomorrow with the "proper" Samsung cable to check if that's the issue.

I've tried USB with and without debugging enabled, as well as in several of the USB ports of the machine. I am rather sure the problem does not exist on the PC hardware (8USB ports, 6 of them free...).

We will see what comes out of here, but it is uncomfortable that it takes sooo long to charge...

Cheers