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Thread: Dual monitors, one on-board & one discreet

  1. #1
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    Dual monitors, one on-board & one discreet

    Hi,

    I would like some assistance setting up (or attempting to set up) a dual monitor configuration using one screen plugged into my ATI Radeon HD 6850 and the other into the motherboard on-board graphics. I am using Ubuntu 12.04.

    lshw:

    Code:
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                    product: Barts HDMI Audio [Radeon HD 6800 Series]
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    The interesting thing is, the monitor attached to the on-board shows some activity when booting, I see the Ubuntu boot/shut-down screens but once I am in Ubuntu it just goes blank. There isn't any error on the screen about checking the cable etc. but it remains black.

    It also doesn't show up under "Displays" and obviously nothing in the Catalyst Control Centre about it.

    edit: When I switch to a TTY my display connected to the on-board becomes active and the other one goes blank. Switching back to TTY-7 they reverse again :/

    xorg.conf:
    Code:
    Section "ServerLayout"
    	Identifier     "aticonfig Layout"
    	Screen      0  "aticonfig-Screen[0]-0" 0 0
    EndSection
    
    Section "Module"
    	Load  "glx"
    EndSection
    
    Section "Monitor"
    	Identifier   "aticonfig-Monitor[0]-0"
    	Option	    "VendorName" "ATI Proprietary Driver"
    	Option	    "ModelName" "Generic Autodetecting Monitor"
    	Option	    "DPMS" "true"
    EndSection
    
    Section "Device"
    	Identifier  "aticonfig-Device[0]-0"
    	Driver      "fglrx"
    	BusID       "PCI:1:0:0"
    EndSection
    
    Section "Screen"
    	Identifier "Default Screen"
    	DefaultDepth     24
    EndSection
    
    Section "Screen"
    	Identifier "aticonfig-Screen[0]-0"
    	Device     "aticonfig-Device[0]-0"
    	Monitor    "aticonfig-Monitor[0]-0"
    	DefaultDepth     24
    	SubSection "Display"
    		Viewport   0 0
    		Depth     24
    	EndSubSection
    EndSection
    I see there is nothing about Intel in this file...



    Cheers
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    Last edited by not found; November 25th, 2012 at 11:02 AM.
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  2. #2
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    Re: Dual monitors, one on-board & one discreet

    you can't have two different cards active at the same time.
    Check out my Blog about my life and computer software and hardware. http://ubuntuaddicted.blogspot.com/
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  3. #3
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    Re: Dual monitors, one on-board & one discreet

    Quote Originally Posted by dannyboy79 View Post
    you can't have two different cards active at the same time.
    I am trying this again because it works very well in Windows :/

    BUMP!



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  4. #4
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    Re: Dual monitors, one on-board & one discreet

    Quote Originally Posted by dannyboy79 View Post
    you can't have two different cards active at the same time.
    I don't know how to help you, not found, sorry, but I also don't believe that dannyboy is right about this. I can recall seeing a video a while back about some monster compiz setup using 6 monitors, and, if I recall rightly, it was using 3 dual head cards.

    If xrandr can't deal with it, you might need to look into creating an xorg.config file. I think it would involve defining a device for each card, but beyond that I would have to start delving into the documentation.
    Michael

  5. #5
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    Re: Dual monitors, one on-board & one discreet

    i didn't think it was possible but this thread may shead some light.
    http://ubuntuforums.org/showthread.php?t=53966
    Check out my Blog about my life and computer software and hardware. http://ubuntuaddicted.blogspot.com/
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  6. #6
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    Re: Dual monitors, one on-board & one discreet

    Thanks for the link

    I just tried Ubuntu 12.10 and before installing the proprietary ATI drivers I could see two monitors when selecting display (the second was disabled and when I tried to enable it the system froze) so at least some progress of sorts.

    Then installed the ATI drivers and then the system would only work on the Intel display but when I logged in Unity would crash (seems the Intel can't handle the fallback mode for Unity 3D or something) and the ATI display wasn't working well, sometimes resolution being out of range other times just being purple :/

    I have had a quick look at the thread you linked, not sure how relevant anymore as the info has become severely dated but it does offer proof of a possibility


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  7. #7
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    Re: Dual monitors, one on-board & one discreet

    Quote Originally Posted by not found View Post
    ... not sure how relevant anymore as the info has become severely dated ...
    This is true in as much as Ubuntu now uses xrandr or whatever, but as far as I know, if an xorg.config is present, it will still be used. the nvidia driver still creates one, for instance. Or at least it did the last time I installed one, which is not that long ago. I also don't think the format and structure of xorg.config has been changed to any great extent. I believe the method described should still work in principle.
    Michael

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