It's a Toshiba dynadock U3.0, I don't know the chipset but from what I can see in the log files I have the hardware ID details from System_Details:
Code:
dynadock U3.0
USB\VID_17E9&PID_4305&REV_3015&MI_00
dynadock Ethernet
USB\VID_17E9&PID_4305&REV_3015&MI_05
dynadock U3.0
USB\VID_17E9&PID_4305&REV_3015&MI_01
dynadock Audio
USB\VID_17E9&PID_4305&REV_3015&MI_02
USB Composite Device
USB\VID_17E9&PID_4305&REV_3015
It looks virtually identical to yours except for the branding and extra 3.5mm audio ports on the back.