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thedevilsjester 10-30-2012 04:34 PM

Three Monitors, Two Graphics Cards
 
I am running Ubuntu 12.10 and am trying to set up a multi monitor display.

By default the two monitors that are hooked up to the on board graphics card work great, but the one hooked up to the add on card is blank.

All of the results I can find either do not apply to my situation, or are much older (pre Unity, using xorg files that I either do not have, or cannot find anymore)

LSPCI Reports

00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09)

03:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV516 [Radeon X1300/X1550 Series]

03:00.1 Display controller: Advanced Micro Devices [AMD] nee ATI RV516 [Radeon X1300 Pro] (Secondary)


Is there anything I can do to get this third monitor to work? I am not tied to Ubuntu, is there another distro that is known to work with a setup like this out of the box?

Rodebian 10-30-2012 04:43 PM

If I understand you correctly you are trying to use two graphic cards? On onboard one and one in a pci-e or agp slot? If so I doubt very much you can do that. Your computer (Hardware side of it,) will only let you use one or the other. However if you have two, for example, pci-e slots for graphics cards then you can tie them in together with a set up, for example, two nvidia cards with sli. But the pci-e slots need to be pci-e 16X. On onboard intergrated card and one in your graphics card slot will not work at the same time.

thedevilsjester 10-30-2012 04:52 PM

Quote:

Originally Posted by Rodebian (Post 4818490)
If I understand you correctly you are trying to use two graphic cards? On onboard one and one in a pci-e or agp slot? If so I doubt very much you can do that. Your computer (Hardware side of it,) will only let you use one or the other. However if you have two, for example, pci-e slots for graphics cards then you can tie them in together with a set up, for example, two nvidia cards with sli. But the pci-e slots need to be pci-e 16X. On onboard intergrated card and one in your graphics card slot will not work at the same time.

It works quite nicely on Windows 7 (which was the OS previously being used on this machine before I took it over), which means it is likely not a hardware limitation. I would much rather use Linux on this machine though, so I am looking for a solution to keep the same monitor setup. It is not my hardware so I am not able to make any modifcations/additions to that aspect.

Rodebian 10-30-2012 04:55 PM

If it has worked before then great. I always thought the onboard one and the slot ones never worked together. Mine doesn't sadly and they are both Nvidia.

thedevilsjester 10-30-2012 09:37 PM

Quote:

Originally Posted by Rodebian (Post 4818497)
If it has worked before then great. I always thought the onboard one and the slot ones never worked together. Mine doesn't sadly and they are both Nvidia.

I do not pretend to know anything about this subject other than it works great when I boot into Windows 7 but only uses the two monitors from the add on when I boot Linux.

adamk75 10-31-2012 05:13 AM

Quote:

Originally Posted by thedevilsjester (Post 4818485)
All of the results I can find either do not apply to my situation, or are much older (pre Unity, using xorg files that I either do not have, or cannot find anymore)

You do realize you can create an xorg.conf file, right? Try starting with the ones you found on-line, and modifying them for your needs. If you still have problems, show us the xorg.conf file you ended up with and the Xorg log file.

Adam

thedevilsjester 11-01-2012 02:45 PM

Quote:

Originally Posted by adamk75 (Post 4818809)
You do realize you can create an xorg.conf file, right? Try starting with the ones you found on-line, and modifying them for your needs. If you still have problems, show us the xorg.conf file you ended up with and the Xorg log file.

Adam

While I appreciate recommendations, this sounds like a recipe for disaster. If this were a laptop with set hardware, I might find a xorg file on the net with similar hardware / setup and use it as a basis, but if I knew enough about xorg.conf files to make the major changes that would be nessisary with any xorg file I found on the net, I would probably not need to grab one from the net.

Is there a command in Ubuntu that will make xorg generate an xorg.conf file based on the current settings so I have a sane base to start from?

TobiSGD 11-01-2012 03:24 PM

I would recommend to begin with showing us the output of the command
Code:

xrandr
It should show you all the connected displays, if they are activated and which resolution they are running.

TobiSGD 11-01-2012 03:26 PM

Quote:

Originally Posted by Rodebian (Post 4818490)
However if you have two, for example, pci-e slots for graphics cards then you can tie them in together with a set up, for example, two nvidia cards with sli. But the pci-e slots need to be pci-e 16X.

Just for the correction. If you want to run multiple monitors you can do that with a dual graphics solution, but if you activate SLI (Nvidia) or CrossfireX (AMD) you will limit yourself to one monitor. Also, you don't need PCIe x16 for this, in fact, most consumer mainboards only have two x8 slots if you activate SLI/CrossfireX.

Rodebian 11-01-2012 03:39 PM

Quote:

Originally Posted by TobiSGD (Post 4819965)
Just for the correction. If you want to run multiple monitors you can do that with a dual graphics solution, but if you activate SLI (Nvidia) or CrossfireX (AMD) you will limit yourself to one monitor. Also, you don't need PCIe x16 for this, in fact, most consumer mainboards only have two x8 slots if you activate SLI/CrossfireX.

I stand corrected. Thank you for clarifying that. Just when I thought I knew everything to ;-)

thedevilsjester 11-02-2012 11:11 AM

Quote:

Originally Posted by TobiSGD (Post 4819963)
I would recommend to begin with showing us the output of the command
Code:

xrandr
It should show you all the connected displays, if they are activated and which resolution they are running.

xrandr outputs the following:

Code:

Screen 0: minimum 320 x 200, current 2560 x 1024, maximum 8192 x 8192
VGA1 connected 1280x1024+1280+0 (normal left inverted right x axis y axis) 376mm x 301mm
  1280x1024      60.0*+  75.0 
  1280x960      60.0 
  1280x800      74.9    59.8 
  1152x864      75.0 
  1280x768      74.9    59.9 
  1024x768      75.1    70.1    60.0 
  1024x576      60.0 
  800x600        72.2    75.0    60.3    56.2 
  848x480        60.0 
  640x480        72.8    75.0    60.0 
  720x400        70.1 
HDMI1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
  1280x1024      60.0*+  75.0 
  1280x960      60.0 
  1280x800      74.9    59.9 
  1152x864      75.0 
  1280x768      74.9    60.0 
  1024x768      75.1    70.1    60.0 
  1024x576      60.0 
  800x600        72.2    75.0    60.3    56.2 
  848x480        60.0 
  640x480        72.8    75.0    60.0 
  720x400        70.1 
DP1 disconnected (normal left inverted right x axis y axis)

I have three identical monitors.

Ubuntu's "Displays" UI only shows the two that are connected to the onboard chip. The other one just says (on its screen) that it has no input.

The restricted drivers application (that, oddly, did not come preinstalled with 12.10 ...) does not list anything, if this makes any difference.


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