On 1/12/07, Alan Stern <[EMAIL PROTECTED]> wrote:
> On Fri, 12 Jan 2007, Jon Smirl wrote:
>
> > Using 2.6.20-rc4 on a system with an ICH4, it fails the same way as
> > the device did on the ICH5. This is starting to point to a broken
> > resume capability in the device. I have more systems around but they
> > are all ICH4/5.
> >
> > So why does the device work when plugged into a powered hub? Do the
> > ports on the powered hub not do suspend/resume?
>
> I doubt that.  Besides, even if they don't the root ports certainly do.
> Once the root hub suspends the external hub, the device will be suspended
> along with it.

I'll do one more test. I don't think I powered on with the device in a
hub standalone and the drivers disabled, and then modprobe'd them in.

>
> It could be a power-level issue.  The external powered hub may provide a
> higher voltage or more current than the root port, and the device may need
> that little bit extra in order to resume.

But usbreset works and that should take the same power level or more.

>
> > This device is a desktop USB audio device and was not designed for
> > portable use. It could be that Philips just never implemented/tested
> > suspend/resume on it.
>
> Could be.  Or maybe they tested it with a powered hub.
>
> > Is there a way to force USB suspend/resume under Windows as a comparison?
>
> I don't know.  A Linux-oriented mailing list isn't the best place to get
> information about Windows.  :-)
>
> Alan Stern
>
>


-- 
Jon Smirl
[EMAIL PROTECTED]

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