84:00.0 VGA compatible controller [0300]: ATI Technologies Inc R580 [Radeon X1900 XT] (Primary) [1002:7249]
84:00.1 Display controller [0380]: ATI Technologies Inc R580 [Radeon X1900 XT] (Secondary) [1002:7269]
# /usr/bin/rhd_conntest 84:00.0
Checking connectors on 0x7249, 0x1002, 0x0B12  (@84:00:00):
  Load Detection: RHD_OUTPUT_TMDSA
  HotPlug: RHD_HPD_0 RHD_HPD_1
  DDC: RHD_DDC_0 RHD_DDC_1
  DDC Line[0]: Slaves: a0
  DDC Line[1]: Slaves: 6e a0
# /usr/bin/rhd_conntest 84:00.1
Unknown device: 0x1002:0x7269 (84:00.01).
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