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Old 11-19-2012, 05:11 PM   #1
dchicks
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Multi-Display Debacle (Just can't seem to get it working right.)


I was the fortunate recipient of a new machine at the office. It's nice! 16G RAM and a 6-core Xeon processor. It also came with an ATI graphics card that supports 4 monitors. Sweet! But all is not so great...

I have installed Fedora 17 and I prefer to run KDE. The monitors are all plugged in and working, but there is weirdness. I had to swap the cables around between monitors 2 and 3 because the display manager always wanted to have them ordered 1,3,2,4. I'd really like to make #2 my primary display, also, instead of having to move things the entire length of the combined display. When I make that change, though, some of the screens magically get changed into clones. It seems that the display manager in KDE has some serious shortcomings.

I'm not afraid to edit the xorg.conf file directly, if that will help, but so far I have seen nothing change in that file that would lead me to believe it makes any difference.

Can someone point me to a resource that will help explain how this is supposed to work?

Thanks,
Dave
 
Old 11-20-2012, 11:16 AM   #2
reguser23
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Hi Dave,

I had a similar problem with my dual monitor set up. I am using Slackware64 14 and KDE 4.8.5 with ATI 4870. I also had clone monitors by default.

This is what worked for me. Go to K button -> Applications -> System -> Screen Resize & Rotate(KRandRTray)

On the Size & Orientation tab you should see every monitor connected to your video card. You can change the size, refresh rate, orientation, and position of every monitor. There is a "Identify Outputs" button that shows you which monitor is connected to what connection. By default the first connection is set to position Absolute 0 0, you can change the position of the other monitors by clicking on the position of monitors 2,3,4 to be changed to "Left of", or "Right, of", etc. This is necessary so that you can can identify which monitor is connected to which connection. Once you identify the monitors there is an option on "Primary output" and you can set your monitor 2 to be your primary display. Once that is completed you can click on "Save as Default" button. If you have any more questions let me know. Good luck.
 
Old 11-20-2012, 11:25 AM   #3
dchicks
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Thanks for the feedback.

Your procedure sounds very much like what I've already been doing, except that I've been using the System Settings app to get to the Size and Orientation program. The problem I've encountered with it is that when I make modifications in the Size and Orientation app, it makes other changes that are unwanted. For instance, when I change the Primary Display value, it resets some of my screens to be clones.

I suspect that there is a bug in the code with respect to more than 2 monitors, because it's not likely to have been as well tested with more. So, I was hoping I could find a file that I could just edit by hand.

Thanks again!
Dave
 
Old 11-20-2012, 11:46 AM   #4
reguser23
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If your screens reset to clones whenever you set a specific monitor to be your primary then it must be a bug. You should report it to Fedora or KDE. I was also hoping to configure my set up by editing a file and actually asked the question(in the Slackware section) if there is a file we can configure, but no one answered. Please keep me posted on this.
 
  


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