Re: Generic USB 2.0 hub showing up as USB 1.1

On Sat, 29 Dec 2007 16:39:50 -0500, Yousuf Khan wrote:

> I have two generic 4-****t 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 ****ts 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?!
> 
> Any idea what's going on with this hub?

I can almost guaranty that an operating system can't leave any USB hub
(fixed). 

Can you compare the data transfer rate of the hub in question while in XP
to that in linux? Take a large file say 100 megs and transfer it from an
external drive and time it. I'd like to see which is faster, XP or linux
or if it;s the same.