Re: USB erratic after update a couple weeks ago

July 3, 2009

Paul Furman wrote:

> Durn thing has a mind of its own. Whole groups of USB ports turn

> themselves on & off every 10 minutes now.

>

> This seems to be a possible explanation/fix:

> [ Re: USB stops working after recent Windows Update

> It is more of a hardware problem believe it or not. The thing is that

> some motherboards have internal watchdogs to make sure that USB ports

> are not overloaded since they consume on average 500 mA of current. This

> mechanism of kicking off some additional USB ports also involves the OS,

> or course. What perhaps happened was that after some updates the demand

> on the MB went up because of some additional work Vista needs to do now

> perhaps on a short term basis (like for a few minutes) and it just trips

> over the threshold.]

>

> What I did is... I had 2 USB hubs daisy chained in one port of the

> 'puter, so I plugged each individually into a port... at least some of

> the probs seem to have resolved. Of course I had it set up that way for

> a reason... some devices only worked plugged direct to the 'puter but

> who knows, maybe that's not a problem now? Er, yeah, still a problem but

> some more port switching seems to resolve partly. USB voodoo...

So, it's not solved... that was a partial workaround which lessened my

problems slightly. Anyone else experiencing these problems? Any more ideas?

--

Paul Furman

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