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[ale] Multiple monitors on Wheezy



I currently have two 23" monitors on my Wheezy desktop box. Now I've added
a second video card (identical to the first) so that I can have a third and
maybe a fourth monitor if needed. I installed the Nvidia drivers using
these instructions:

https://wiki.debian.org/NvidiaGraphicsDrivers

 If I use the Nvidia GUI tool to enable the third monitor, it seems to
work, and even changes the xorg file, but the settings don't stick and the
file reverts to dual monitor on a single card.

$ lspci | grep GeForce
01:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 8400
GS] (rev a2)
06:00.0 VGA compatible controller: NVIDIA Corporation GT218 [GeForce 8400
GS] (rev a2)

*This first config shows the settings with 2 monitors working perfectly on
1 video card:*

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 304.88  (pbuilder at cake)  Wed Apr  3 08:58:25
UTC 2013

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Acer AL2216W"
    HorizSync       30.0 - 82.0
    VertRefresh     56.0 - 76.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8400GS"
    BusID          "PCI:1:0:0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "CRT-0"
    Option         "metamodes" "CRT-0: nvidia-auto-select +0+0, CRT-1:
nvidia-auto-select +1680+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

*This second config shows what the file looks like after enabling the
second card using the Nvidia S server setting tool:*

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 304.88  (pbuilder at cake)  Wed Apr  3 08:58:25
UTC 2013

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" RightOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Acer AL2216W"
    HorizSync       30.0 - 82.0
    VertRefresh     56.0 - 76.0
    Option         "DPMS"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "Acer V233H"
    HorizSync       31.0 - 83.0
    VertRefresh     56.0 - 76.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8400GS"
    BusID          "PCI:1:0:0"
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8400GS"
    BusID          "PCI:6:0:0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "CRT-0"
    Option         "metamodes" "CRT-0: nvidia-auto-select +0+0, CRT-1:
nvidia-auto-select +1680+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "metamodes" "nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection


However, the third monitor never displays anything even though it's clearly
being detected. I've tried both outputs on the new card. If I exit our of
the Nvidia tool, the settings are not saved and next time I open it I have
to detect the monitor again. I've tried with and without xinerama.

Any ideas?

cheers
ed

-- 
Edward Holcroft | Madsen Kneppers & Associates Inc.
11695 Johns Creek Parkway, Suite 250 | Johns Creek, GA 30097
O (770) 446-9606 | M (770) 630-0949

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