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Subject: RE: Windoze 98se & Slow USB 2.0
From: Touillaud Nicolas (Nicolas.Touillaud_at_fr.thalesgroup.com)
Date: 2004-02-19


No idea, sorry.
The hub won't help if it behave like the controler itself (cheap usb2 hubs
do), but I'm not sure, I don't think the USB can change its speed once
connected, so an empty usb hub should remain a 2.0 peripheral once a 1.1
device is plugged.
Once again, I have not tested this.

Good luck with your Vaio !

Nicolas

-----Message d'origine-----
De : Leif Sawyer [mailto:lsawyer_at_gci.com]
Envoyé : jeudi 19 février 2004 12:12
À : Rockbox development
Objet : RE: Windoze 98se & Slow USB 2.0

Touillaud Nicolas says:
> a possible reason for full speed:
> some USB2 adaptors can't handle full and high speed at the
> same time, i.e. the slower usb device atached set the
> maximum speed. the problem is hardware related...
> A friend of mine had this problem using the built-in usb
> controler of its sony vaio, he just unplugged the mouse,
> re-plug it's 2.0 external drive and shazzam ! High speed!

If this is the case (and i'm very interested, as I just ordered
a sony vaio z1 !) then a small inline-powered USB 2.0 hub should
allow all the devices to exist peacefully, yes?

The line from the outboard hub to the computer should stay locked
at 480mhz, while between the device and the hub it's 12mhz.

At least, I'd hope that it works that way! I know it does for
ethernet, but haven't done a lot of research in the USB side
to know this is correct/allowed behavior...

Leif
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