On Mon, 14 Mar 2005, Derek Broughton wrote: > On Monday 14 March 2005 04:23, Michael Marte wrote: > > > > usbview tells me that there is root hub running at high speed (driven > > by ehci) and two more hubs running at full speed (driven by ohci). > > Interestinlgy, the full speed hubs are not children of the root hub but > > occur on the same level of the USB device tree as the root hub. Some > > thought and questions on this situation: > > > > * Why are there three hubs - not only one? > > In short, because that's the way your hardware manufacturers and software > configuration set it up. My Inspiron, with two USB ports, has two hubs. > Doesn't seem necessary, but it's in the ACPI implementation, iirc. The "full > speed" (ack! I hate that weasel term) hubs are there because you have ohci > configured - why? If you have it compiled as a module, try removing it, then > plugging something in - should still work, using ehci. When you plugged in a > high-speed device, it bypassed the USB 1.1 hubs and went right to the 2.0 hub > - which makes it pretty obvious why you can't have the 1.1 hubs as children > of the root. > -- > derek
I blacklisted ohci and, in effect, USB devices connected to either of the two ports are not recognized any more. I have to modprobe ohci to get them connected. Michael -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
