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[PROBLEM] Sapphire 6870 and Framebuffer

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When you say all the ports arent working..

Is this when you already have the DVI-D plugged in and want to plug another monitor in? Because that is a known issue with this type of graphics card, you can have multiple monitors but not when using the DVI-D port.

If it is not what I have stated above, have you tried using HDMI (for example) from boot. i.e. shut the computer down, unplug the DVI-D, plug in the HDMI and boot it up.
 
brownin said:
When you say all the ports arent working..

Is this when you already have the DVI-D plugged in and want to plug another monitor in? Because that is a known issue with this type of graphics card, you can have multiple monitors but not when using the DVI-D port.

If it is not what I have stated above, have you tried using HDMI (for example) from boot. i.e. shut the computer down, unplug the DVI-D, plug in the HDMI and boot it up.
Click to expand...

Well, I have been testing with two screen:

I plugged a small screen in the DVI-i port (main display) and a larger one as secondary (HDMI).

In the first test I changed my plist to PCI=1
I was able to the second display in HDMI port, but unable to load the Framebuffer.
pci1.jpg



In the second test, again, I removed the PCI=1 string and the Framebuffer loaded without need to do anything else but, again, the HDMI display didn't work.

A weird thing is that the system actually detect the HDMI screen but seems to be unable to send video data to the monitor.

pci0.jpg


I'm clueless right now.
 
I know this is an old thread but...

I have the exact same Graphic Card and the same problem : if I load Duckweed framebuffer, HDMI is detected but remains blank where my screen connected to DP is fine !

Have you found a way to solve this problem ?
 
OSX Yosemite
GA-H67A-USB3-B3 |  i3 2125 |  Radeon HD 6870
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