Hi,

add 

none            /proc/bus/usb   usbdevfs faults                 0       0

into /etc/fstab

then write
mount -a

It's done.
After a reboot, I did "mount -t usbdevfs none /proc/bus/usb" from the USB-howto . It confirmed me it was already mounted. But it is strange that /proc/bus/usb/device file is still empty. Then I did "hciconfig hci0 up" and I still have "Can't init device hci0. Connection timed out(110)"

But the hciconfig message changed. It is now:

"hci0:   Type: USB
        BD Address: 00:00:00:00:00:00 ACL MTU: 0:0 SCO MTU: 0:0
        DOWN
        RX bytes:0 acl:0 sco:0 events:0 errors:0
        TX bytes:6 acl:0 sco:0 commands:2 errors:0"

No idea why I have so much difficulties with this dongle.

Regards,

Ben