Mr. Popman,
Tried your configuration and it worked as well. Thank You! Here is my ioreg.
ioreg | grep ati
| | | +-o UHCI Root Hub Simulation@1A <class IOUSBRootHubDevice, id 0x10000026b, registered, matched, active, busy 0 (2 ms), retain 13>
| | | +-o UHCI Root Hub...