Weird xinerama behavior using 3 sceens(on 2 Nvidia Cards)

[llavalle]

Ok, here's my setup :
GF7900GT(1) --> 20" samsung lcd (dvi)
GF7900GT(2) --> 17" LG lcd (vga)
GF7600GS(1) --> 17" LG lcd (vga).


When I use only the 7900GT in twinview mode, everything is fine. I know I must configure an extra screen for the second video card. I did it, and all 3 screens showed data. Mouse was going from one to the other OK... but one problem tho : xinerama would only report 2 screens instead of 3!

One on the 7600GS and one on the 7900GT (the 2 screens combined).
That's kind of frustating cause apps show their screens in the middle of the 2 rights monitor...

Is there a way to fix that?? (telling xinerama to distinguish between the 2 card and between the 2 screen on the 7900GT)

Here's my xorg.conf file :

Using drivers : 1.0-9755 and Xorg 1.1 on gentoo

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 1280 0
    Screen      1  "Screen1" LeftOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
EndSection

Section "Files"
    RgbPath         "/usr/lib/X11/rgb"
EndSection

Section "Module"
    Load           "dbe"
    Load           "extmod"
    Load           "type1"
    Load           "freetype"
    Load           "glx"
EndSection

Section "ServerFlags"
    Option         "Xinerama" "0"
EndSection

Section "InputDevice"
    # generated from data in "/etc/conf.d/gpm"
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol"
    Option         "Device" "/dev/input/mice"
    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      "LG L1720B"
    HorizSync       30.0 - 83.0
    VertRefresh     56.0 - 75.0
    Option         "DPMS"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "LG L1720B"
    HorizSync       30.0 - 83.0
    VertRefresh     56.0 - 75.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Videocard0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 7900 GT/GTO"
    BusID          "PCI:6:0:0"
EndSection

Section "Device"
    Identifier     "Videocard1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 7600 GS"
    BusID          "PCI:5:0:0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Videocard0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "1"
    Option         "metamodes" "CRT: 1280x1024 +1600+0, DFP: 1600x1200 +0+0; CRT: 1024x768 +0+0, DFP: NULL; CRT: 800x600 +0+0, DFP: NULL; CRT: 640x480 +0+0, DFP: NULL"
    SubSection     "Display"
        Depth       24
        Modes      "1600x1200" "1280x1024" "1024x768" "800x600" "640x480"
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Videocard1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "metamodes" "nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
        Modes      "1600x1200" "1280x1024" "1024x768" "800x600" "640x480"
    EndSubSection
EndSection

[netllama]

I'm I'm following you correctly, then this is expected behavior. Twinview counts as a single X screen (not two).

[JaXXoN]

Hi!

I have created a patch for the Xserver to fix that:

http://www.nvnews.net/vbulletin/show...7&postcount=10

regards

Bernhard

[llavalle]

Originally Posted by netllama

I'm I'm following you correctly, then this is expected behavior. Twinview counts as a single X screen (not two).

What I mean is that the applications think I have 2 screens instead of 3... (when using 3 monitor on 2 cards)

When using only one card (2 monitors on 1 card) it's fine.

[netllama]

http://www.nvnews.net/vbulletin/showthread.php?t=46678

[llavalle]

Heres the report

[netllama]

As I stated earlier, you do have two X screens. One with Twinview, and a 2nd using the 7600GS card. There's nothing wrong here.

[JaXXoN]

Originally Posted by netllama

There's nothing wrong here.

The situation is that loosing the nvidia twinview xinerama extension
can be pretty annoying for a triple-head setup. For details, please check:

http://www.nvnews.net/vbulletin/show...95&postcount=1
http://www.nvnews.net/vbulletin/show...7&postcount=10

regards

Bernhard

[llavalle]

Originally Posted by JaXXoN

The situation is that loosing the nvidia twinview xinerama extension
can be pretty annoying for a triple-head setup. For details, please check:
Bernhard

Exactly. As soon as I enable a 2nd screen, Xinerama on the first one is lost.