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I'm trying to get my Intel HD 4400 and AMD Radeon 8670M working with the open source drivers. If I boot with an xorg.conf that includes:

Section "Device"
    Identifier      "Intel Graphics"
    Driver          "intel"
    BusID           "PCI:0:2:0"

Section "Device"
    Identifier      "8670M"
    Driver          "radeon"
    BusID           "PCI:6:0:0"

Section "Screen"
    Identifier      "Default Screen"
    Monitor         "Configured Monitor"
    Device          "Intel Graphics"

Then I don't have a problem, but if I try and set the "Default Screen" to use the "8670M" device, I boot only into low graphics mode.

I am also getting various messages in kern.log such as

radeon 0000:06:00.0: No connectors reported connected with modes

Xorg.0.log gives similar sounding messages Radeon no outputs connected, unable to definitely find connected outputs, Radeon(0): No modes, no screens found.

Anyone have any ideas?

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I have the same problem with this two video cards, and I still can't find the answers... With the Intel video card, I can only run Unity2D, but with the AMD card the graphical interface only start in low graphics mode.

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