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Dual monitor (vga & hdmi)

GTX670 Mountain Lion

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#1
akma

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Hi guys,

I am currently running ML 10.8.3 in a machine with the following specs:
- Gigabyte gtx 670
- Gigabyte z77x-udh5
- core i5 3570k

For the past half year I have used a single monitor setup using a VGA (only) monitor connected to the DVI-I connector of the gtx 670.
Recently I bought a second monitor and my intention is to connect both to the graphic card. Hence, I connected the new monitor to the HDMI connector of the graphic card.

The problem is that when I boot into OSX with both monitors connected the VGA->DVI-I one goes to sleep (after the apple logo) while the HDMI returns a blank/gray screen, my impression is that OSX freezes completely.
When I boot with only one of the monitors connected, everything goes well.
If i boot with only one monitor connected and connect the second one after the boot the OSX will freeze and force me into a hard-reboot.
Moreover, when I boot into Windows 7 everything works fine, so I suspect is possible to use VGA+HDMI.

I have google it and some people ( that had the some problem with the gtx 560) suggest adding

<key>GraphicsEnabler</key>
<string>Yes</string>

to the chameleon plist, it didn't work for me.

Do you guys have any suggestions ?

thanks
Flavio

#2
BALDY_MAN

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try VGA TO DVI Adapter and use both on you graphics card

#3
akma

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Hi Baldy_Man,
thank you for your reply.
That is what i am currently doing, I am connecting both my monitors to the graphic card, the VGA only monitor using a VGA to DVI-I adaptor and connecting the second monitor to the HDMI of the graphic card. :/

#4
BALDY_MAN

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Have you tryed GraphicEnabler=No
OR <key>SkipNvidiaGfx</key>
<string>Yes</string>

In bootplist

#5
akma

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Hi BALDY_MAN,

thkx for your reply,

I tried both and didn't work, what did work was to connect the HDMI monitor into the DVI-D connecter with and adaptor (HDMI to DVI-D).
Nevertheless it is odd that OSX is unable to handle two monitors connected through HDMI and DVI-I at the same time, do you think it may be related with the audio drivers?

#6
BALDY_MAN

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i dont think its sound related
could be the way the graphics card reads the signal from the monitor in mac osx
(im guessing)

#7
Rampage Dev

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Strange issue. Have you tried both DVI ports? If so perhaps a Mini Display port to VGA would be the workarond.

#8
gunsha

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i have the same problem, but with a Zotac GT 440, have you managed to make it work ? 



#9
akma

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Hi @gunsha,

 

(assuming that you have a monitor that is VGA only and another that is DVI-D/HDMI compatible)

I have solved my problem by connecting both monitors to the DVI Ports (for the vga monitor you need an adaptor VGA to DVI-A)

 

For some unknown reason it is seemingly impossible to have a dual monitor set up using the HDMI and the DVI-A port.

 

hope it helps

cheers



#10
Gringo Vermelho

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akma: What happens when you boot into Windows is of no consequence.

 

I'm sure it can be done. Google/forum search this:

 

display-cfg

 

NVCAP

 

If using GraphicsEnabler, both of these can be set in org.chameleon.Boot.plist. You can also use NVEnabler.kext, find the NVEnabler topic over at the ProjectOSX forums and see what you can find.








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