Very Computer

by **Chris Thomso** » Thu, 22 Feb 2001 17:25:11

My system has 2 physical USB root hubs on the motherboard (One built in and
the other on a PCI card). I'm using Mandrake 7.2. Both work fine under
windows, but in Linux only the hub on the PCI card has it's devices
detected. Any idea why?

I'm fairly confident that Linux surports the builtin hub as my USB zip drive
which is connected to it was detected when I installed Mandrake but
disappeared as soon as the syetem booted.

Also, I know the zip drive is set up and configured, because if i plug it
into the PCI card it works fine.

Cheers

Chris

by **Tony Hag** » Thu, 22 Feb 2001 19:04:40

>My system has 2 physical USB root hubs on the motherboard (One built in and
>the other on a PCI card). I'm using Mandrake 7.2. Both work fine under
>windows, but in Linux only the hub on the PCI card has it's devices
>detected. Any idea why?

My guess would be that one of the host controllers is uhci (e.g., Intel,
VIA), the other ohci (just about everyone else) and that you only have
the drivers for one of them compiled into the kernel/loaded as modules.
Have a look at /proc/pci or lspci, and see what you have if you don't
already know. I think (?) I am right in saying that a uhci controller
will appear in I/O space, ohci in memory.

Tony.
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Very Computer

2 USB root hubs problem

2 USB root hubs problem

2 USB root hubs problem