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Old 10-27-2012, 08:34 PM   #1
Registered: Feb 2006
Distribution: Slackware
Posts: 418

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X, KDE and three large monitors

I have three 1920x1080 monitors, rotated to portrait mode. The objective is a roughly 3k x 2k display. I would like it as one desktop.

Slackware 14.0 64bit stock distribution is being used.

krandrtray was used to properly orient each display and position each display, into a 3x1 array.

1. If I apply wallpaper to the desktop, it only shows in the middle display. (I would like it across all three displays.)

2. The toolbar will not size across physical displays. I would like it to span the bottom of all three displays.

xorg.conf shows that xinerama is true.

Any suggestions?
Old 10-31-2012, 02:44 PM   #2
Registered: Feb 2006
Distribution: Slackware
Posts: 418

Original Poster
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I am open for any ideas. Things are usable, but I don't have the environment I was expecting given my experience with two monitor systems.

Old 10-31-2012, 08:14 PM   #3
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Registered: Apr 2004
Location: Brisbane, Australia
Distribution: pclinuxos slackware64 tails kali
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What else do you have in /etc/X11/xorg.conf, or /etc/X11/xorg.conf.d

I have two different displays, with different wall-papers.

I'm using kde4.

# File generated by XFdrake (rev 262502)

Section "ServerLayout"
    Identifier "Layout0"
    InputDevice "Keyboard0" "CoreKeyboard"
    Screen 0  "Screen0" 0 0
    Option "Xinerama" "0"

Section "Files"
    FontPath "/usr/share/fonts/default/Type1"

Section "Module"
    Disable "dri"
    Load "dbe" # Double-Buffering Extension
    Load "v4l" # Video for Linux
    Load "extmod"
    Load "glx" # 3D layer

Section "InputClass"
    MatchProduct "Razer Razer Orochi"
    Identifier "mouse speed adjustment"
    MatchIsPointer "on"
    Option "ConstantDeceleration" "2"

Section "InputDevice"
    # generated from data in "/etc/sysconfig/keyboard"
    Identifier "Keyboard0"
    Driver "kbd"
    Option "XkbModel" "pc105"
    Option "XkbLayout" "us"

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier "Monitor0"
    VendorName "Unknown"
    ModelName "BenQ G2420HD"
    HorizSync 24.0 - 83.0
    VertRefresh 50.0 - 76.0
    Option "DPMS"

Section "Device"
    Identifier "Device0"
    VendorName "NVIDIA Corporation"
    BoardName "GeForce GTX 570"
    Driver "nvidia"
    VideoRam 1417216 # 1384mb
    BusID "PCI:1:0:0"
    Option "PCI ID" "1086:10de"

Section "Screen"
    Identifier "Screen0"
    Device "Device0"
    Monitor "Monitor0"
    DefaultDepth 24
    Subsection "Display"
        Depth 24
    Option "TwinViewXineramaInfoOrder" "DFP-0"
    Option "TwinView" "1"
    Option "metamodes" "DFP: 1920x1080 +0+0, CRT: nvidia-auto-select +1920+0"

Section "Extensions"
    Option "Composite" "Enable"
    Option "RENDER" "Enable"
    Option "HWCursor"
Old 11-06-2012, 06:59 AM   #4
Registered: Apr 2007
Location: Barcelona, Spain
Distribution: Debian, KUbuntu
Posts: 213

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If you use KDE, you can go to KDE configuration suite into Screen and monitor section. There you'll find all tools needed for whatever you want. I'm not sure if Slackware has these configurations, but at least they are present whit KUbuntu (Ubuntu with KDE).
Old 11-25-2012, 08:57 AM   #5
Registered: Feb 2006
Distribution: Slackware
Posts: 418

Original Poster
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This is just a follow up note, as I close this thread out.

I never did manage to get an xorg.conf that would work. I did manage to get all three displays running and use KRandRTray to rotate and place each monitor using absolute coordinates.

This solution does not persist, and I end up reconfiguring things each boot. That's OK for now, I have work to do on that system, and I can get it done.

The quest for the right solution with a reasonably elegant implementation will be held off for another day. Meanwhile brighter crayons and I will undoubtedly sketch out better solutions.


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