On Wed, Feb 02, 2011 at 02:36:49PM -0800, Joshua Scoggins wrote: > Hello, > > Two months ago I purchased a USB 3.0 card for my computer and it > worked amazingly well with Linux right out of the box. I got > tired of having to reach behind my computer to switch cables so I > purchased a USB 3.0 hub last week You did? From where? What specific model is this? I didn't think that USB 3.0 hubs were on the market just yet (yes, I have one I found in Japan, but it doesn't really work all that well...) > and while Linux detects the > hub and knows its a SuperSpeed device it is automatically downgraded > to USB 2.0 speeds. I checked the dmesg > log and it said the following: > > "usb 2-1: new SuperSpeed USB device using xhci_hcd and address 2" > <more messages> > "hub 2-1:1.0: config failed, can't read hub descriptor (err -22)" > > The interesting part is that the transfer rate of all three of my USB > 3.0 HDD enclosures in this mode is about 30-40 megabytes per second. > If I plug the device into the ports on the back of the computer > directly I get 80-125 megabytes per second so I know it's an issue > with the hub. > I even double checked that I didn't get scammed using Kinfocenter and > it said that it was a USB 3.0 hub with a VIA chipset with a USB 2.0 > hub > subdevice. > > My question is am I doing something wrong or is this a bug? What kernel version are you using? Can you try 2.6.38-rc3 to see if your hub works with that release? thanks, greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
