I followed the tonymacx86 guide iboot ATI-5xxx3,XFX ref.model.,10.6.4, graphics update.
All ports send video,(2dvi,HDMI,DP) I can get dual monitor support any way (ports wise) but cannot connect 3 monitors simultaneously.
I have 2 dell u2410's and a 50"720p Panasonic plasma, dual display will work either 2 dell's or 1 dell and plasma.
When i have all 3 monitors connected and click detect displays the 2 24" dells (DVI) try and detect every minute or so,and the 50"720p display does nothing.I do not have another cpu monitor or smaller display to try as of now.
HDMI does not send audio and i cant figure it out must need additional kext or something?
ATI Radeon HD 5870:
Chipset Model: ATI Radeon HD 5870
Type: GPU
Bus: PCIe
Slot: Slot-1
PCIe Lane Width: x16
VRAM (Total): 1024 MB
Vendor: ATI (0x1002)
Device ID: 0x6898
Revision ID: 0x0000
ROM Revision: 113-B7710C-176
EFI Driver Version: 01.00.318
DELL U2410:
Resolution: 1920 x 1200 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Display Connector:
Status: No Display Connected