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648 Posts

07-20-2009

United States of America

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Re: TPT2 has USB port power issue

2013-02-14, 12:42 PM

@ScruffR, I was trying to be sarcastic when I wrote 'uninformed / unreasonably demanding customers' because of the comments by Lenovo apologists in this thread. I guess I should have been more clear. Given how many laptops and tablets seem to exceed the USB specifications I personally think it's no surprise that consumers expect their unpowered single-cord drives to work on any USB port, including the TPT2.

 

I don't really expect there is a software fix to the issue though, so people should probably either learn to work around this issue (powered hubs, additional compact USB power supply like the tiny iPhone one) or return the tablet. 

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5033 Posts

12-22-2008

Canada

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Re: TPT2 has USB port power issue

2013-02-14, 13:22 PM

wrote:
Have a look at post #108 and #133 in this thread. 

Thanks. I didn't read through all 20+ pages before posting.

 

Nevertheless there's a simple solution that addresses the issue in almost all situations: A USB Y-cable.

 



My comments are mine. I don't work for or speak for Lenovo.
Please do not send me PMs. Ask your question on this forum so that everyone can respond or learn.

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38 Posts

01-11-2013

Saudi Arabia

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Re: TPT2 has USB port power issue

2013-02-14, 13:53 PM

Now everyone knows about USB low power problem (Minuits 3:15):
http://www.youtube.com/watch?v=d00wXIEtC50&list=UUW6J17hZ_Vgr6cQgd_kHt5A&index=1

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1808 Posts

08-17-2011

USA

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Re: TPT2 has USB port power issue

2013-02-14, 14:03 PM
Thanks. Anyone have a direct link to the review on their sites, not YouTube?
===================
Don't get mad, get root.
3679CTO
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1118 Posts

12-06-2012

Netherlands

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Re: TPT2 has USB port power issue

2013-02-14, 15:30 PM

I don't think the ThinkPad review is up on the MobileTechReview site yet - should be coming soon.

----------------------------

The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc.

 

The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ...

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1808 Posts

08-17-2011

USA

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Re: TPT2 has USB port power issue

2013-02-14, 17:17 PM
Thanks.
===================
Don't get mad, get root.
3679CTO
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226 Posts

10-08-2011

Florida

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Re: TPT2 has USB port power issue

2013-02-14, 20:19 PM

Mark, I saw the note below on the Wi-Fi issue thread yesterday.  Is there an official USB issue update you can share yet?  Thanks again for being attentive to this and the other threads.


wrote:
I'm going to update the USB thread, so let's keep the issues seperate.  The short answer is that our USB port meets the USB 2.0 spec fully. 

Mark


 

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55 Posts

02-14-2013

USA

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Re: TPT2 has USB port power issue

2013-02-15, 0:29 AM
LOL Mark_Lenovo.... the only USB 2.0 that meets ful specs but cant power an external HD. Aperrantly eveyone else is using a different USB 2.0 spec for their devices.

Also a question, didint one of those guys from Lenovo unboxed or whatever tried to plug in an external hard drive on this thing before it was released?
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168 Posts

12-10-2008

United States of America

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Re: TPT2 has USB port power issue

2013-02-15, 1:31 AM

wrote:
Also a question, didint one of those guys from Lenovo unboxed or whatever tried to plug in an external hard drive on this thing before it was released?

Yes, but only hard drives that fully meet the USB 2.0 specs were considered for testing.

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66 Posts

01-21-2013

Seattle, Washington, USA

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Re: TPT2 has USB port power issue

2013-02-15, 8:57 AM

Why in the world are people assuming that just about every USB 2.0 hard disk drive draws more power than the spec allows?

HELLO?!?!?!?

What would happen to a company that sold such a drive? Well, they'd have a HUGE return rate as their devices failed to work on certain computers. They'd develop a reputation for shoddy engineering. And they'd go out of business.

Have you EVER heard of a USB-powered disk drive not working on ANY OTHER computer? I sure haven't. Heck, they usually even work on USB 1.0 ports (but VERY slowly).

People, it's clear to me that what's going on here is that the TPT2 is NOT compliant with the USB 2.0 specification with regard to high power (500mA) devices. There was one report quite far back of someone who installed another version of Windows on the tablet and solved the problem--so my guess is that this is a software/driver problem. My guess would be that the power negotiation is not being handled properly. (A USB device must start in low-power [100mA] mode when it's first connected; it then asks for more power.)

Everybody who writes software creates bugs. If the problem is a software problem, Lenovo should be able to fix it easily (but perhaps not immediately). If it's a hardware issue, I'd sure like to know about it before I get a TPT2.

What's REALLY bugging me about this is that Lenovo is not telling us what the story is.

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