works on my home machine as USBKR100 USB 10/100 LAN
but doesn't on other saying
uhub1: device problem, disabling port 1 (or any other to which i'll 
connect)

device is sold as USB 2.0

the machine in which is does NOT work is athlon64 with such usb:

ohci0 at pci0 dev 2 function 0: Nvidia nForce3 250 USB Host Controller 
(rev. 0xa1)
ohci0: interrupting at ioapic0 pin 5 (irq 5)
ohci0: OHCI version 1.0, legacy support
usb0 at ohci0: USB revision 1.0
uhub0 at usb0
uhub0: Nvidia OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub0: 4 ports with 4 removable, self powered
ohci1 at pci0 dev 2 function 1: Nvidia nForce3 250 USB Host Controller 
(rev. 0xa1)
ohci1: interrupting at ioapic0 pin 5 (irq 5)
ohci1: OHCI version 1.0, legacy support
usb1 at ohci1: USB revision 1.0
uhub1 at usb1
uhub1: Nvidia OHCI root hub, class 9/0, rev 1.00/1.00, addr 1
uhub1: 4 ports with 4 removable, self powered
ehci0 at pci0 dev 2 function 2: Nvidia nForce3 250 USB2 Host Controller 
(rev. 0xa2)
ehci0: interrupting at ioapic0 pin 5 (irq 5)
ehci0: EHCI version 1.0
ehci0: companion controllers, 4 ports each: ohci0 ohci1




can ehci be a problem? should i try to disable it?