Re: [Bluez-users] 3 or more BT dongles over 1 USB-2.0 4-port HUB

[Marcel Holtmann <marcel@holtmann.org>]

Hi Petr,

> i have problem with three (and more) USB BT dongles (all are the same, 
> CSR-based) and 4-port USB-2.0 HUB.
> 
> When i attach one USB dongle alone, everything is good (hci0 is up and 
> running). When i attach the second dongle (after the first), still is 
> everything OK (hci0 and hci1 are up and running).
> But when i attach third (or fourth) dongle, this does not work.
> 
> I tried attaching all dongles differently but every time the third (or fourth) 
> dongle is not OK and dmesg says:
> #dmesg
> hci_usb_intr_rx_submit: hci2 intr rx submit failed urb cd55b674 err -28

try loading the hci_usb driver with the isoc=0 option. This maybe helps,
but it can also be a general problem with your USB root hub. In that
case you have to check with the USB guys, because this is not Bluetooth
specific.

Regards

Marcel



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