src/rhd_id.c
...
/* 0x71C2 : RV530 : Radeon X1600 */
425     { 0x71C2, 0x17EE, 0x71C0, "Connect3D Radeon X1600 Pro", VGA_B1_DVI_AA00 },
...

and I have 
metres conntest # ./rhd_conntest 03:00:00
Checking connectors on 0x71C2, 0x174B, 0x0840  (@03:00:00):
  Load Detection: RHD_OUTPUT_TMDSA
  HotPlug: RHD_HPD_0
  DDC: RHD_DDC_1
metres conntest # ./rhd_conntest 03:00:01
Unknown device: 0x1002:0x71E2 (03:00.01).