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26 Posts

01-06-2013

United States

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Re: TPT2 has USB port power issue

2013-01-15, 12:45 PM

Intially I thought this might have been an easy firmware of driver fix, but this delay in Lenovo's response got me thinking otherwise now.

 

Why is it so difficult to get the right tablet? The Asus Vivo Tab Smart was starting to look like a great alternative but no Digitizer...

 

#**bleep** OEMs

 

 

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23 Posts

01-16-2013

Australia

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Re: TPT2 has USB port power issue

2013-01-16, 8:14 AM

Officially, all a USB port is supposed to supply is a minimum of 100mA, which may just power USB drives, etc.

 

Usually a desktop can supply 2.5A (at 5V = 2.5W), with some providing higher current. This is suppossedly the MAXIMUM a peripheral can EVER expect to get from a single USB port.

 

Some laptops, especially if they have a beefier battery, may also provide more than the bare minimum.

 

 

Typically, USB DVD drives have a high startup current that cannot be provided from the USB ports on compact devices. This is why you may experience a drive repeatedly trying to get enough momemtum to get the moptor up to speed. I did buy a Samsung DVD that could startup and work off the power from a single USB port. Presumably the Lenovo one does the same.

 

Where a USB peripheral provides a Y cable, it may be expecting BOTH connections to be able to supply the maximum. So if the device to which the data connection is made does not provide the maximum, the other MUST provide more to compensate.

 

Note that where tablets can be charged from a USB port, they will probably not charge much (if at all) from a normal USB port, but instead require their supplied plugpack which may put out as much as 2A.

 

 

As advised earlier, look at the current supplying capacity of the port under Device Manager, and then do not try to exceed that.

 

 

I would expect a USB port on a low-powered tablet to be able to drive thumbdrives, keyboards (but not necessarily backlit ones) and specially designed low-power, motorised peripherals, but not just anything USB.

 

Other manufacturers may supply more power to their USB ports, but that is their perogative.

 

 

Need to realistic as well. A well-engineered, low-powered tablet is not going to drive all the USB peripherals that a desktop or beefy laptop is. If you want 10 hours battery life, trying to drive a peripheral that uses a 1/4 to a 1/3 of the power a battery normally only supplies to the tablet will seriously compromise that.

 

 

So given that, does the TPT2 USB port handle all the name brand thumbdrives? How about low-powered DVD burners like the Samsung SE 208AB?

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72 Posts

01-05-2013

East Coast USA

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Re: TPT2 has USB port power issue

2013-01-16, 11:54 AM

Your reply would be useful if ALL the other atom tablets out now didn't have usb ports which worked.  I know from personal experience both the Samsung 500t and the Acer w510 uusb ports worked with anything I threw at them, including dvd players that came with Y cables.  Reports from the dell 10 forums report the same, that it works with everything.

 

No, there is something going on here specific to the tpt2.  I'm quite surprised by the lack of tech support, Mark why did you disappear?

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391 Posts

08-25-2011

Iran, Tehran

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Re: TPT2 has USB port power issue

2013-01-16, 12:24 PM
@patanjali

As Spinedoc stated, what you are saying is not acceptable. Every other Clover Trail tablets are working with any kind of USB devices. Lenovo's official words tells the same story.

So if you want to convince yourself through some explanations, feel free. But we want something that we're told.
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ThinkPad Tablet 2 - 367927U
ThinkPad Tablet - 183822U
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35 Posts

01-08-2013

NZ

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Re: TPT2 has USB port power issue

2013-01-16, 20:31 PM
It would be really good if someone from Lenovo posted an update on this, even if it's a work in progress.

Can someone please give us an idea of where this issue is at?
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14 Posts

12-07-2012

Germany

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Re: TPT2 has USB port power issue

2013-01-16, 23:14 PM

I don't want to use USB devices all the time when I'm underway. But, if someone want to connect some USB device to the tablet, I want to be sure that it'll work for that time! For me personally this fix for the "USB port issue" is very important.

@Lenovo: Please provide a solution for this "USB port problem".

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26 Posts

01-06-2013

United States

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Re: TPT2 has USB port power issue

2013-01-17, 4:21 AM

This thread back to the top.

 

 

Lenovo has got to respond to us on this matter.

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28 Posts

12-05-2012

Denmark

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Re: TPT2 has USB port power issue

2013-01-17, 11:36 AM

Well 8 days since Mark replied on the matter.

 

Got mine today and i took 8 minutes to confirm that none of my USB gadgets worked on the TPT2..

 

Come on Lenovo.

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26 Posts

01-06-2013

United States

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Re: TPT2 has USB port power issue

2013-01-17, 17:30 PM

Thread back to the top.

 

Lenovo please provide feedback.

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3 Posts

01-16-2013

United States

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Re: TPT2 has USB port power issue

2013-01-17, 18:37 PM

Bump!  I too would like a solution to this problem.  Thanks!

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