xinerama, 2 cards, 3 monitors Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern) 2019 Community Moderator Election Results Why I closed the “Why is Kali so hard” questionDual monitor configuration on Intel Ivy BridgeSetting dual monitor with different resolutions using ati open source driverSecond monitor detected but not receiving signal?Cannot start xserver - “Failed to assign any connected display devices to X screen 0”xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)Why doesn't my right screen refresh correctly when my left screen does?Three monitors on two video cards (NVIDIA and RADEON)Desktop spanning all monitorsDebian: could not get screen informationexternal monitor not detected after loginRandR with internal intel iGPU and old Trident card

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xinerama, 2 cards, 3 monitors



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
2019 Community Moderator Election Results
Why I closed the “Why is Kali so hard” questionDual monitor configuration on Intel Ivy BridgeSetting dual monitor with different resolutions using ati open source driverSecond monitor detected but not receiving signal?Cannot start xserver - “Failed to assign any connected display devices to X screen 0”xf86EnableIOPorts: failed to set IOPL for I/O (Operation not permitted)Why doesn't my right screen refresh correctly when my left screen does?Three monitors on two video cards (NVIDIA and RADEON)Desktop spanning all monitorsDebian: could not get screen informationexternal monitor not detected after loginRandR with internal intel iGPU and old Trident card



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5















I've been trying to get this right and I'm so nearly there, but not quite. This machine has an Intel adapter with one monitor, and an ATI adapter with two. I'm happy to use xinerama to get this working.



Here is my xorg.conf (Ubuntu 12.04):-



Section "Monitor"
Identifier "Dell1"
Option "DPMS"
EndSection

Section "Monitor"
Identifier "Dell2"
Option "DPMS"
Option "Left" "Dell3"
EndSection

Section "Monitor"
Identifier "Dell3"
Option "DPMS"
EndSection

Section "Device"
Identifier "intel"
Driver "intel"
BusID "PCI:0:2:0"
EndSection

Section "Device"
Identifier "ati"
Driver "radeon"
BusID "PCI:2:0:0"
# Option "Monitor-DVI-0" "Dell3"
# Option "Monitor-VGA-1" "Dell2"
EndSection

Section "Screen"
Identifier "Screen 0"
Device "intel"
#Monitor "Dell1"
DefaultDepth 24
EndSection

Section "Screen"
Identifier "Screen 1"
Device "ati"
Monitor "Dell2"
SubSection "Display"
Depth 24
Virtual 2560 1024
EndSubSection
EndSection

Section "ServerLayout"
Option "xinerama" "on"
Identifier "multihead"
Screen "Screen 0"
Screen "Screen 1" LeftOf "Screen 0"
EndSection

Section "Module"
Load "glx"
EndSection


All three monitors are 1280x1024 Dells. With this, I get all three monitors live. The one connected to the Intel (the rightmost) is the primary



Physical arrangement on desk:



[ Dell 3 ] [ Dell 2 ] [ Dell 1 ]
ATI Intel


X server layout:



[Dell 2 ] ] [ Dell 1 ]
[ Dell 3 ] [ ]


By this, I mean that if you start at the RHS on Dell 1, and move left, you jump to Dell 3 next. Dell 3 is showing a virtual size of 2560, and as you hit the left edge of it, it starts to pan. At this point, you also appear on Dell 2, and by the time you hit the leftmost edge, Dell 3 and 2 are showing the same thing.



How can I get the monitors to lay out correctly?



Many thanks!



John



EDIT:-



Tried this instead, and again it almost works. Without the "Primary" options I get Unity on Dell1 and black screens on the others (but mouse moves across). With "Primary" options I get no Unity, background on all monitors which flickers, displays flicker when keys pressed, and it's generally very odd.



Section "Monitor"
Identifier "Dell1"
Option "DPMS"
Option "Primary" "False"
EndSection

Section "Monitor"
Identifier "Dell2"
Option "DPMS"
Option "Primary" "False"
EndSection

Section "Monitor"
Identifier "Dell3"
Option "DPMS"
Option "Primary" "True"
EndSection

Section "Device"
Identifier "intel"
Driver "intel"
BusID "PCI:0:2:0"
EndSection

Sec>tion "Device"
Identifier "ati0"
Driver "radeon"
Option "ZaphodHeads" "DVI-0"
BusID "PCI:2:0:0"
Screen 0
EndSection

Section "Device"
Identifier "ati1"
Driver "radeon"
Option "ZaphodHeads" "VGA-1"
BusID "PCI:2:0:0"
Screen 1
EndSection

Section "Screen"
Identifier "Screen 0"
Device "intel"
Monitor "Dell1"
DefaultDepth 24
EndSection

Section "Screen"
Identifier "Screen 1"
Device "ati0"
Monitor "Dell2"
DefaultDepth 24
EndSection

Section "Screen"
Identifier "Screen 2"
Device "ati1"
Monitor "Dell3"
DefaultDepth 24
EndSection

Section "ServerLayout"
Option "xinerama" "on"
Identifier "multihead"
Screen "Screen 0"
Screen "Screen 1" LeftOf "Screen 0"
Screen "Screen 2" LeftOf "Screen 1"
EndSection

Section "Module"
Load "glx"
EndSection









share|improve this question






























    5















    I've been trying to get this right and I'm so nearly there, but not quite. This machine has an Intel adapter with one monitor, and an ATI adapter with two. I'm happy to use xinerama to get this working.



    Here is my xorg.conf (Ubuntu 12.04):-



    Section "Monitor"
    Identifier "Dell1"
    Option "DPMS"
    EndSection

    Section "Monitor"
    Identifier "Dell2"
    Option "DPMS"
    Option "Left" "Dell3"
    EndSection

    Section "Monitor"
    Identifier "Dell3"
    Option "DPMS"
    EndSection

    Section "Device"
    Identifier "intel"
    Driver "intel"
    BusID "PCI:0:2:0"
    EndSection

    Section "Device"
    Identifier "ati"
    Driver "radeon"
    BusID "PCI:2:0:0"
    # Option "Monitor-DVI-0" "Dell3"
    # Option "Monitor-VGA-1" "Dell2"
    EndSection

    Section "Screen"
    Identifier "Screen 0"
    Device "intel"
    #Monitor "Dell1"
    DefaultDepth 24
    EndSection

    Section "Screen"
    Identifier "Screen 1"
    Device "ati"
    Monitor "Dell2"
    SubSection "Display"
    Depth 24
    Virtual 2560 1024
    EndSubSection
    EndSection

    Section "ServerLayout"
    Option "xinerama" "on"
    Identifier "multihead"
    Screen "Screen 0"
    Screen "Screen 1" LeftOf "Screen 0"
    EndSection

    Section "Module"
    Load "glx"
    EndSection


    All three monitors are 1280x1024 Dells. With this, I get all three monitors live. The one connected to the Intel (the rightmost) is the primary



    Physical arrangement on desk:



    [ Dell 3 ] [ Dell 2 ] [ Dell 1 ]
    ATI Intel


    X server layout:



    [Dell 2 ] ] [ Dell 1 ]
    [ Dell 3 ] [ ]


    By this, I mean that if you start at the RHS on Dell 1, and move left, you jump to Dell 3 next. Dell 3 is showing a virtual size of 2560, and as you hit the left edge of it, it starts to pan. At this point, you also appear on Dell 2, and by the time you hit the leftmost edge, Dell 3 and 2 are showing the same thing.



    How can I get the monitors to lay out correctly?



    Many thanks!



    John



    EDIT:-



    Tried this instead, and again it almost works. Without the "Primary" options I get Unity on Dell1 and black screens on the others (but mouse moves across). With "Primary" options I get no Unity, background on all monitors which flickers, displays flicker when keys pressed, and it's generally very odd.



    Section "Monitor"
    Identifier "Dell1"
    Option "DPMS"
    Option "Primary" "False"
    EndSection

    Section "Monitor"
    Identifier "Dell2"
    Option "DPMS"
    Option "Primary" "False"
    EndSection

    Section "Monitor"
    Identifier "Dell3"
    Option "DPMS"
    Option "Primary" "True"
    EndSection

    Section "Device"
    Identifier "intel"
    Driver "intel"
    BusID "PCI:0:2:0"
    EndSection

    Sec>tion "Device"
    Identifier "ati0"
    Driver "radeon"
    Option "ZaphodHeads" "DVI-0"
    BusID "PCI:2:0:0"
    Screen 0
    EndSection

    Section "Device"
    Identifier "ati1"
    Driver "radeon"
    Option "ZaphodHeads" "VGA-1"
    BusID "PCI:2:0:0"
    Screen 1
    EndSection

    Section "Screen"
    Identifier "Screen 0"
    Device "intel"
    Monitor "Dell1"
    DefaultDepth 24
    EndSection

    Section "Screen"
    Identifier "Screen 1"
    Device "ati0"
    Monitor "Dell2"
    DefaultDepth 24
    EndSection

    Section "Screen"
    Identifier "Screen 2"
    Device "ati1"
    Monitor "Dell3"
    DefaultDepth 24
    EndSection

    Section "ServerLayout"
    Option "xinerama" "on"
    Identifier "multihead"
    Screen "Screen 0"
    Screen "Screen 1" LeftOf "Screen 0"
    Screen "Screen 2" LeftOf "Screen 1"
    EndSection

    Section "Module"
    Load "glx"
    EndSection









    share|improve this question


























      5












      5








      5


      2






      I've been trying to get this right and I'm so nearly there, but not quite. This machine has an Intel adapter with one monitor, and an ATI adapter with two. I'm happy to use xinerama to get this working.



      Here is my xorg.conf (Ubuntu 12.04):-



      Section "Monitor"
      Identifier "Dell1"
      Option "DPMS"
      EndSection

      Section "Monitor"
      Identifier "Dell2"
      Option "DPMS"
      Option "Left" "Dell3"
      EndSection

      Section "Monitor"
      Identifier "Dell3"
      Option "DPMS"
      EndSection

      Section "Device"
      Identifier "intel"
      Driver "intel"
      BusID "PCI:0:2:0"
      EndSection

      Section "Device"
      Identifier "ati"
      Driver "radeon"
      BusID "PCI:2:0:0"
      # Option "Monitor-DVI-0" "Dell3"
      # Option "Monitor-VGA-1" "Dell2"
      EndSection

      Section "Screen"
      Identifier "Screen 0"
      Device "intel"
      #Monitor "Dell1"
      DefaultDepth 24
      EndSection

      Section "Screen"
      Identifier "Screen 1"
      Device "ati"
      Monitor "Dell2"
      SubSection "Display"
      Depth 24
      Virtual 2560 1024
      EndSubSection
      EndSection

      Section "ServerLayout"
      Option "xinerama" "on"
      Identifier "multihead"
      Screen "Screen 0"
      Screen "Screen 1" LeftOf "Screen 0"
      EndSection

      Section "Module"
      Load "glx"
      EndSection


      All three monitors are 1280x1024 Dells. With this, I get all three monitors live. The one connected to the Intel (the rightmost) is the primary



      Physical arrangement on desk:



      [ Dell 3 ] [ Dell 2 ] [ Dell 1 ]
      ATI Intel


      X server layout:



      [Dell 2 ] ] [ Dell 1 ]
      [ Dell 3 ] [ ]


      By this, I mean that if you start at the RHS on Dell 1, and move left, you jump to Dell 3 next. Dell 3 is showing a virtual size of 2560, and as you hit the left edge of it, it starts to pan. At this point, you also appear on Dell 2, and by the time you hit the leftmost edge, Dell 3 and 2 are showing the same thing.



      How can I get the monitors to lay out correctly?



      Many thanks!



      John



      EDIT:-



      Tried this instead, and again it almost works. Without the "Primary" options I get Unity on Dell1 and black screens on the others (but mouse moves across). With "Primary" options I get no Unity, background on all monitors which flickers, displays flicker when keys pressed, and it's generally very odd.



      Section "Monitor"
      Identifier "Dell1"
      Option "DPMS"
      Option "Primary" "False"
      EndSection

      Section "Monitor"
      Identifier "Dell2"
      Option "DPMS"
      Option "Primary" "False"
      EndSection

      Section "Monitor"
      Identifier "Dell3"
      Option "DPMS"
      Option "Primary" "True"
      EndSection

      Section "Device"
      Identifier "intel"
      Driver "intel"
      BusID "PCI:0:2:0"
      EndSection

      Sec>tion "Device"
      Identifier "ati0"
      Driver "radeon"
      Option "ZaphodHeads" "DVI-0"
      BusID "PCI:2:0:0"
      Screen 0
      EndSection

      Section "Device"
      Identifier "ati1"
      Driver "radeon"
      Option "ZaphodHeads" "VGA-1"
      BusID "PCI:2:0:0"
      Screen 1
      EndSection

      Section "Screen"
      Identifier "Screen 0"
      Device "intel"
      Monitor "Dell1"
      DefaultDepth 24
      EndSection

      Section "Screen"
      Identifier "Screen 1"
      Device "ati0"
      Monitor "Dell2"
      DefaultDepth 24
      EndSection

      Section "Screen"
      Identifier "Screen 2"
      Device "ati1"
      Monitor "Dell3"
      DefaultDepth 24
      EndSection

      Section "ServerLayout"
      Option "xinerama" "on"
      Identifier "multihead"
      Screen "Screen 0"
      Screen "Screen 1" LeftOf "Screen 0"
      Screen "Screen 2" LeftOf "Screen 1"
      EndSection

      Section "Module"
      Load "glx"
      EndSection









      share|improve this question
















      I've been trying to get this right and I'm so nearly there, but not quite. This machine has an Intel adapter with one monitor, and an ATI adapter with two. I'm happy to use xinerama to get this working.



      Here is my xorg.conf (Ubuntu 12.04):-



      Section "Monitor"
      Identifier "Dell1"
      Option "DPMS"
      EndSection

      Section "Monitor"
      Identifier "Dell2"
      Option "DPMS"
      Option "Left" "Dell3"
      EndSection

      Section "Monitor"
      Identifier "Dell3"
      Option "DPMS"
      EndSection

      Section "Device"
      Identifier "intel"
      Driver "intel"
      BusID "PCI:0:2:0"
      EndSection

      Section "Device"
      Identifier "ati"
      Driver "radeon"
      BusID "PCI:2:0:0"
      # Option "Monitor-DVI-0" "Dell3"
      # Option "Monitor-VGA-1" "Dell2"
      EndSection

      Section "Screen"
      Identifier "Screen 0"
      Device "intel"
      #Monitor "Dell1"
      DefaultDepth 24
      EndSection

      Section "Screen"
      Identifier "Screen 1"
      Device "ati"
      Monitor "Dell2"
      SubSection "Display"
      Depth 24
      Virtual 2560 1024
      EndSubSection
      EndSection

      Section "ServerLayout"
      Option "xinerama" "on"
      Identifier "multihead"
      Screen "Screen 0"
      Screen "Screen 1" LeftOf "Screen 0"
      EndSection

      Section "Module"
      Load "glx"
      EndSection


      All three monitors are 1280x1024 Dells. With this, I get all three monitors live. The one connected to the Intel (the rightmost) is the primary



      Physical arrangement on desk:



      [ Dell 3 ] [ Dell 2 ] [ Dell 1 ]
      ATI Intel


      X server layout:



      [Dell 2 ] ] [ Dell 1 ]
      [ Dell 3 ] [ ]


      By this, I mean that if you start at the RHS on Dell 1, and move left, you jump to Dell 3 next. Dell 3 is showing a virtual size of 2560, and as you hit the left edge of it, it starts to pan. At this point, you also appear on Dell 2, and by the time you hit the leftmost edge, Dell 3 and 2 are showing the same thing.



      How can I get the monitors to lay out correctly?



      Many thanks!



      John



      EDIT:-



      Tried this instead, and again it almost works. Without the "Primary" options I get Unity on Dell1 and black screens on the others (but mouse moves across). With "Primary" options I get no Unity, background on all monitors which flickers, displays flicker when keys pressed, and it's generally very odd.



      Section "Monitor"
      Identifier "Dell1"
      Option "DPMS"
      Option "Primary" "False"
      EndSection

      Section "Monitor"
      Identifier "Dell2"
      Option "DPMS"
      Option "Primary" "False"
      EndSection

      Section "Monitor"
      Identifier "Dell3"
      Option "DPMS"
      Option "Primary" "True"
      EndSection

      Section "Device"
      Identifier "intel"
      Driver "intel"
      BusID "PCI:0:2:0"
      EndSection

      Sec>tion "Device"
      Identifier "ati0"
      Driver "radeon"
      Option "ZaphodHeads" "DVI-0"
      BusID "PCI:2:0:0"
      Screen 0
      EndSection

      Section "Device"
      Identifier "ati1"
      Driver "radeon"
      Option "ZaphodHeads" "VGA-1"
      BusID "PCI:2:0:0"
      Screen 1
      EndSection

      Section "Screen"
      Identifier "Screen 0"
      Device "intel"
      Monitor "Dell1"
      DefaultDepth 24
      EndSection

      Section "Screen"
      Identifier "Screen 1"
      Device "ati0"
      Monitor "Dell2"
      DefaultDepth 24
      EndSection

      Section "Screen"
      Identifier "Screen 2"
      Device "ati1"
      Monitor "Dell3"
      DefaultDepth 24
      EndSection

      Section "ServerLayout"
      Option "xinerama" "on"
      Identifier "multihead"
      Screen "Screen 0"
      Screen "Screen 1" LeftOf "Screen 0"
      Screen "Screen 2" LeftOf "Screen 1"
      EndSection

      Section "Module"
      Load "glx"
      EndSection






      ubuntu xorg x11 multi-monitor






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited May 2 '12 at 17:10







      JohnCC

















      asked May 2 '12 at 15:16









      JohnCCJohnCC

      16614




      16614




















          1 Answer
          1






          active

          oldest

          votes


















          1














          I am not sure if this helps - but I had some problems on CentOS with a dual-head-configuration, too.



          What finally worked:



          Section "ServerLayout"
          Identifier "Multihead layout"
          Screen 0 "Screen0" LeftOf "Screen1"
          Screen 1 "Screen1" 0 0
          InputDevice "Keyboard0" "CoreKeyboard"
          Option "Xinerama" "on"
          Option "Clone" "on"
          EndSection


          For the Monitors (two identical ones) I only left one modeline and commented out the Sync and refresh lines:



          Section "Monitor"
          Identifier "Monitor0"
          VendorName "Monitor Vendor"
          ModelName "Dell 1905FP (Digital)"
          ### Comment all HorizSync and VertSync values to use DDC:
          # HorizSync 30.0 - 81.0
          # VertRefresh 56.0 - 76.0
          Option "dpms"
          Option "xrandr"
          Modeline "1280x1024" 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
          EndSection

          Section "Monitor"
          Identifier "Monitor1"
          VendorName "Monitor Vendor"
          ModelName "Dell 1905FP (Digital)"
          ### Comment all HorizSync and VertSync values to use DDC:
          # HorizSync 30.0 - 81.0
          # VertRefresh 56.0 - 76.0
          Option "dpms"
          Option "xrandr"
          Modeline "1280x1024" 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
          EndSection


          The video-card is a dual-head ATI (comparable to yours I think). Note the "screen" parameter within the device-section.



          Section "Device"
          Identifier "Videocard0"
          Driver "r500"
          BusID "PCI:3:0:0"
          Option "xrandr" "True"
          Screen 0
          EndSection

          Section "Device"
          Identifier "Videocard1"
          Driver "r500"
          VendorName "Videocard Vendor"
          BoardName "ATI Technologies Inc RV610 [Radeon HD 2400 XT]"
          BusID "PCI:3:0:0"
          Option "xrandr" "True"
          Screen 1
          EndSection


          Now putting it all togehter for the screens - again - I allowed no choice for the resolutions and had to force 24bit:



          Section "Screen"
          Identifier "Screen0"
          Device "Videocard0"
          Monitor "Monitor0"
          DefaultDepth 24
          SubSection "Display"
          Viewport 0 0
          Depth 24
          Modes "1280x1024"
          Virtual 1280 1024
          EndSubSection
          EndSection

          Section "Screen"
          Identifier "Screen1"
          Device "Videocard1"
          Monitor "Monitor1"
          DefaultDepth 24
          SubSection "Display"
          Viewport 0 0
          Depth 24
          Modes "1280x1024"
          Virtual 1280 1024
          EndSubSection
          EndSection


          In KDE I had so set:



          • enable virtual workspaces for multiple monitors

          • Monitor1: x=0, y=0, width=1280, hight=1024

          • Monitor2: x=1280, y=0, width=1280, hight=1024





          share|improve this answer

























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            1 Answer
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            1 Answer
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            active

            oldest

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            active

            oldest

            votes









            1














            I am not sure if this helps - but I had some problems on CentOS with a dual-head-configuration, too.



            What finally worked:



            Section "ServerLayout"
            Identifier "Multihead layout"
            Screen 0 "Screen0" LeftOf "Screen1"
            Screen 1 "Screen1" 0 0
            InputDevice "Keyboard0" "CoreKeyboard"
            Option "Xinerama" "on"
            Option "Clone" "on"
            EndSection


            For the Monitors (two identical ones) I only left one modeline and commented out the Sync and refresh lines:



            Section "Monitor"
            Identifier "Monitor0"
            VendorName "Monitor Vendor"
            ModelName "Dell 1905FP (Digital)"
            ### Comment all HorizSync and VertSync values to use DDC:
            # HorizSync 30.0 - 81.0
            # VertRefresh 56.0 - 76.0
            Option "dpms"
            Option "xrandr"
            Modeline "1280x1024" 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
            EndSection

            Section "Monitor"
            Identifier "Monitor1"
            VendorName "Monitor Vendor"
            ModelName "Dell 1905FP (Digital)"
            ### Comment all HorizSync and VertSync values to use DDC:
            # HorizSync 30.0 - 81.0
            # VertRefresh 56.0 - 76.0
            Option "dpms"
            Option "xrandr"
            Modeline "1280x1024" 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
            EndSection


            The video-card is a dual-head ATI (comparable to yours I think). Note the "screen" parameter within the device-section.



            Section "Device"
            Identifier "Videocard0"
            Driver "r500"
            BusID "PCI:3:0:0"
            Option "xrandr" "True"
            Screen 0
            EndSection

            Section "Device"
            Identifier "Videocard1"
            Driver "r500"
            VendorName "Videocard Vendor"
            BoardName "ATI Technologies Inc RV610 [Radeon HD 2400 XT]"
            BusID "PCI:3:0:0"
            Option "xrandr" "True"
            Screen 1
            EndSection


            Now putting it all togehter for the screens - again - I allowed no choice for the resolutions and had to force 24bit:



            Section "Screen"
            Identifier "Screen0"
            Device "Videocard0"
            Monitor "Monitor0"
            DefaultDepth 24
            SubSection "Display"
            Viewport 0 0
            Depth 24
            Modes "1280x1024"
            Virtual 1280 1024
            EndSubSection
            EndSection

            Section "Screen"
            Identifier "Screen1"
            Device "Videocard1"
            Monitor "Monitor1"
            DefaultDepth 24
            SubSection "Display"
            Viewport 0 0
            Depth 24
            Modes "1280x1024"
            Virtual 1280 1024
            EndSubSection
            EndSection


            In KDE I had so set:



            • enable virtual workspaces for multiple monitors

            • Monitor1: x=0, y=0, width=1280, hight=1024

            • Monitor2: x=1280, y=0, width=1280, hight=1024





            share|improve this answer





























              1














              I am not sure if this helps - but I had some problems on CentOS with a dual-head-configuration, too.



              What finally worked:



              Section "ServerLayout"
              Identifier "Multihead layout"
              Screen 0 "Screen0" LeftOf "Screen1"
              Screen 1 "Screen1" 0 0
              InputDevice "Keyboard0" "CoreKeyboard"
              Option "Xinerama" "on"
              Option "Clone" "on"
              EndSection


              For the Monitors (two identical ones) I only left one modeline and commented out the Sync and refresh lines:



              Section "Monitor"
              Identifier "Monitor0"
              VendorName "Monitor Vendor"
              ModelName "Dell 1905FP (Digital)"
              ### Comment all HorizSync and VertSync values to use DDC:
              # HorizSync 30.0 - 81.0
              # VertRefresh 56.0 - 76.0
              Option "dpms"
              Option "xrandr"
              Modeline "1280x1024" 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
              EndSection

              Section "Monitor"
              Identifier "Monitor1"
              VendorName "Monitor Vendor"
              ModelName "Dell 1905FP (Digital)"
              ### Comment all HorizSync and VertSync values to use DDC:
              # HorizSync 30.0 - 81.0
              # VertRefresh 56.0 - 76.0
              Option "dpms"
              Option "xrandr"
              Modeline "1280x1024" 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
              EndSection


              The video-card is a dual-head ATI (comparable to yours I think). Note the "screen" parameter within the device-section.



              Section "Device"
              Identifier "Videocard0"
              Driver "r500"
              BusID "PCI:3:0:0"
              Option "xrandr" "True"
              Screen 0
              EndSection

              Section "Device"
              Identifier "Videocard1"
              Driver "r500"
              VendorName "Videocard Vendor"
              BoardName "ATI Technologies Inc RV610 [Radeon HD 2400 XT]"
              BusID "PCI:3:0:0"
              Option "xrandr" "True"
              Screen 1
              EndSection


              Now putting it all togehter for the screens - again - I allowed no choice for the resolutions and had to force 24bit:



              Section "Screen"
              Identifier "Screen0"
              Device "Videocard0"
              Monitor "Monitor0"
              DefaultDepth 24
              SubSection "Display"
              Viewport 0 0
              Depth 24
              Modes "1280x1024"
              Virtual 1280 1024
              EndSubSection
              EndSection

              Section "Screen"
              Identifier "Screen1"
              Device "Videocard1"
              Monitor "Monitor1"
              DefaultDepth 24
              SubSection "Display"
              Viewport 0 0
              Depth 24
              Modes "1280x1024"
              Virtual 1280 1024
              EndSubSection
              EndSection


              In KDE I had so set:



              • enable virtual workspaces for multiple monitors

              • Monitor1: x=0, y=0, width=1280, hight=1024

              • Monitor2: x=1280, y=0, width=1280, hight=1024





              share|improve this answer



























                1












                1








                1







                I am not sure if this helps - but I had some problems on CentOS with a dual-head-configuration, too.



                What finally worked:



                Section "ServerLayout"
                Identifier "Multihead layout"
                Screen 0 "Screen0" LeftOf "Screen1"
                Screen 1 "Screen1" 0 0
                InputDevice "Keyboard0" "CoreKeyboard"
                Option "Xinerama" "on"
                Option "Clone" "on"
                EndSection


                For the Monitors (two identical ones) I only left one modeline and commented out the Sync and refresh lines:



                Section "Monitor"
                Identifier "Monitor0"
                VendorName "Monitor Vendor"
                ModelName "Dell 1905FP (Digital)"
                ### Comment all HorizSync and VertSync values to use DDC:
                # HorizSync 30.0 - 81.0
                # VertRefresh 56.0 - 76.0
                Option "dpms"
                Option "xrandr"
                Modeline "1280x1024" 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
                EndSection

                Section "Monitor"
                Identifier "Monitor1"
                VendorName "Monitor Vendor"
                ModelName "Dell 1905FP (Digital)"
                ### Comment all HorizSync and VertSync values to use DDC:
                # HorizSync 30.0 - 81.0
                # VertRefresh 56.0 - 76.0
                Option "dpms"
                Option "xrandr"
                Modeline "1280x1024" 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
                EndSection


                The video-card is a dual-head ATI (comparable to yours I think). Note the "screen" parameter within the device-section.



                Section "Device"
                Identifier "Videocard0"
                Driver "r500"
                BusID "PCI:3:0:0"
                Option "xrandr" "True"
                Screen 0
                EndSection

                Section "Device"
                Identifier "Videocard1"
                Driver "r500"
                VendorName "Videocard Vendor"
                BoardName "ATI Technologies Inc RV610 [Radeon HD 2400 XT]"
                BusID "PCI:3:0:0"
                Option "xrandr" "True"
                Screen 1
                EndSection


                Now putting it all togehter for the screens - again - I allowed no choice for the resolutions and had to force 24bit:



                Section "Screen"
                Identifier "Screen0"
                Device "Videocard0"
                Monitor "Monitor0"
                DefaultDepth 24
                SubSection "Display"
                Viewport 0 0
                Depth 24
                Modes "1280x1024"
                Virtual 1280 1024
                EndSubSection
                EndSection

                Section "Screen"
                Identifier "Screen1"
                Device "Videocard1"
                Monitor "Monitor1"
                DefaultDepth 24
                SubSection "Display"
                Viewport 0 0
                Depth 24
                Modes "1280x1024"
                Virtual 1280 1024
                EndSubSection
                EndSection


                In KDE I had so set:



                • enable virtual workspaces for multiple monitors

                • Monitor1: x=0, y=0, width=1280, hight=1024

                • Monitor2: x=1280, y=0, width=1280, hight=1024





                share|improve this answer















                I am not sure if this helps - but I had some problems on CentOS with a dual-head-configuration, too.



                What finally worked:



                Section "ServerLayout"
                Identifier "Multihead layout"
                Screen 0 "Screen0" LeftOf "Screen1"
                Screen 1 "Screen1" 0 0
                InputDevice "Keyboard0" "CoreKeyboard"
                Option "Xinerama" "on"
                Option "Clone" "on"
                EndSection


                For the Monitors (two identical ones) I only left one modeline and commented out the Sync and refresh lines:



                Section "Monitor"
                Identifier "Monitor0"
                VendorName "Monitor Vendor"
                ModelName "Dell 1905FP (Digital)"
                ### Comment all HorizSync and VertSync values to use DDC:
                # HorizSync 30.0 - 81.0
                # VertRefresh 56.0 - 76.0
                Option "dpms"
                Option "xrandr"
                Modeline "1280x1024" 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
                EndSection

                Section "Monitor"
                Identifier "Monitor1"
                VendorName "Monitor Vendor"
                ModelName "Dell 1905FP (Digital)"
                ### Comment all HorizSync and VertSync values to use DDC:
                # HorizSync 30.0 - 81.0
                # VertRefresh 56.0 - 76.0
                Option "dpms"
                Option "xrandr"
                Modeline "1280x1024" 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
                EndSection


                The video-card is a dual-head ATI (comparable to yours I think). Note the "screen" parameter within the device-section.



                Section "Device"
                Identifier "Videocard0"
                Driver "r500"
                BusID "PCI:3:0:0"
                Option "xrandr" "True"
                Screen 0
                EndSection

                Section "Device"
                Identifier "Videocard1"
                Driver "r500"
                VendorName "Videocard Vendor"
                BoardName "ATI Technologies Inc RV610 [Radeon HD 2400 XT]"
                BusID "PCI:3:0:0"
                Option "xrandr" "True"
                Screen 1
                EndSection


                Now putting it all togehter for the screens - again - I allowed no choice for the resolutions and had to force 24bit:



                Section "Screen"
                Identifier "Screen0"
                Device "Videocard0"
                Monitor "Monitor0"
                DefaultDepth 24
                SubSection "Display"
                Viewport 0 0
                Depth 24
                Modes "1280x1024"
                Virtual 1280 1024
                EndSubSection
                EndSection

                Section "Screen"
                Identifier "Screen1"
                Device "Videocard1"
                Monitor "Monitor1"
                DefaultDepth 24
                SubSection "Display"
                Viewport 0 0
                Depth 24
                Modes "1280x1024"
                Virtual 1280 1024
                EndSubSection
                EndSection


                In KDE I had so set:



                • enable virtual workspaces for multiple monitors

                • Monitor1: x=0, y=0, width=1280, hight=1024

                • Monitor2: x=1280, y=0, width=1280, hight=1024






                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited 10 hours ago









                Rui F Ribeiro

                42.1k1484142




                42.1k1484142










                answered May 21 '12 at 13:39









                NilsNils

                12.8k73771




                12.8k73771



























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