AMD 6670 dual monitors issue

[3Dman]

Hello, I have a Sapphire AMD 6670 1GB with 3 ports: DVI, VGA and HDMI and OS X 10.10.4

I have two monitors one connected to VGA and the other to DVI, when booting with both monitors connected, only the DVI one works and the VGA one gets no signal, but it's probably detected in System Preferences.

 

I'm using a modified Ipomea framebuffer using Clover:

0000000 10000000100000000001000000100101 - VGA 
0000010 04000000140200000001000010000203 - DVI-D 
0000020 00080000040200000001000012040305 - HDMI  

radeon_bios_decode output:

ATOM BIOS Rom: 
	SubsystemVendorID: 0x174b SubsystemID: 0xe194
	IOBaseAddress: 0xee00
	Filename: 1E1949SA.001
	BIOS Bootup Message: 
TURKS XT C33302 HM GDDR5 64MX32                                               
PCI ID: 1002:6758
Connector at index 0
	Type [@offset 44280]: HDMI-A (11)
	Encoder [@offset 44284]: INTERNAL_UNIPHY2 (0x21)
	i2cid [@offset 44354]: 0x94, OSX senseid: 0x5
Connector at index 1
	Type [@offset 44290]: DVI-D (3)
	Encoder [@offset 44294]: INTERNAL_UNIPHY (0x1e)
	i2cid [@offset 44381]: 0x92, OSX senseid: 0x3
Connector at index 2
	Type [@offset 44300]: VGA (1)
	Encoder [@offset 44304]: INTERNAL_KLDSCP_DAC1 (0x15)
	i2cid [@offset 44408]: 0x90, OSX senseid: 0x1 

redsock_bios_decoder: 

TURKS XT C33302 HM GDDR5 64MX32                                               
Subsystem Vendor ID: 174b
       Subsystem ID: e194
Object Header Structure Size: 203
Connector Object Table Offset: 34
Router Object Table Offset: 0
Encoder Object Table Offset: 9d
Display Path Table Offset: 12
Connector Object Id [12] which is [HDMI_TYPE_A]
	encoder obj id [0x21] which is [INTERNAL_UNIPHY2 (osx txmit 0x12 [duallink 0x2] enc 0x4)] linkb: false
Connector Object Id [4] which is [DVI_D]
	encoder obj id [0x1e] which is [INTERNAL_UNIPHY (osx txmit 0x10 [duallink 0x0] enc 0x0)] linkb: false
Connector Object Id [5] which is [VGA]
	encoder obj id [0x15] which is [INTERNAL_KLDSCP_DAC1 (osx txmit 0x00 enc 0x10?)] linkb: false

ROM:

https://www.dropbox.com/s/xl4z3m2swzf4ypm/Sapphire.HD6670.1024.120514.rom?dl=0

 

Any tips on how to make both monitors working together?