Re: USB Mass Storage devices continually reenumerate

Hi,

On 10/17/07, Alan Stern <[email protected]> wrote:
> On Wed, 17 Oct 2007, Mike Nuss wrote:
>
> > > You should try to track the host controller... it looks like device is
> > > drawing to much power and it's getting disconnected. Maybe it's a bug
> > > in controller side.
> > >
> > > Can you try this same devices with another linux box ??
> > >
> >
> > Yes, they work on another box, although I haven't tried with the same
> > kernel, but it has failed with multiple kernel versions on the "bad"
> > system. How could I determine if they're being disconnected for
> > drawing too much power? I've been considering getting the Aardvark
> > full-speed passive bus analyzer but I'm not sure that would be
> > necessary or sufficient.
>
> One way to check for too much power draw is to insert a powered hub
> between the device and the computer.

Yeah, this should probably make things works... but also enabling USB
DEBUGGING you should see some sort of VBUS error thing... or at least
you'd be able to track vbus interrupts and check where they're failing
;-)

>
> Alan Stern
>
>


-- 
Best Regards,

Felipe Balbi
[email protected]

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