"Yousuf Khan" <bbbl67@yahoo.com> wrote in message
news:ipSdnROWzJM6I-vaRVn_vwA@giganews.com...
>I have two generic 4-port USB hubs that are supposed to be USB 2.0
>compliant. The older one is fine, works as advertised. Meanwhile the newer
>one sometimes shows up under the USB 2.0 root hub (i.e. "Standard Enhanced
>PCI to USB Host Controller"), or usually it shows up under the slower
>"Standard OpenHCD USB Host Controller" (USB 1.1).
>
> My motherboard (Asus M2NPV-VM) USB ports are all USB 2.0 compliant, and
> they individually auto-detect whether they need to switch down to USB 1.1
> speeds. I'm using a Microsoft tool called UVCView under Windows XP to
> display the details of the USB devices, including the hubs and roothubs.
>
> According to UVCView, the older hub and newer hub seem to have the same
> chipset vendor (idVendor = "Genesys Logic, Inc."), although externally
> they look quite different and have different brand names. So I'm not sure
> why one would be consistently USB 2.0 compliant, while the other one is
> not.
>
> Now another interesting thing I noticed is that the inconsistent hub will
> only show up as USB 2.0-compliant after I boot into Windows after having
> previously rebooted from Ubuntu 7.10 Linux (dual-boot system). So maybe
> Linux does something to the device that puts it right. But when I list the
> devices while in Linux I see that it is listed under USB 1.1 just like
> when in Windows. I have no idea why Linux leaves the hub fixed for
> Windows, but doesn't fix it for itself?!
>

There are actually surprisingly few different chipsets despite the wide
variety of different looking hubs. I would suggest that you problem hub
either has a poor cable connection or that the hub chipset itself is very
close to being detected as poor USB2 operation in which case it reverts back
to USB1.

Hubs are cheap enough these days that it is simplest just to replace it.