Configurando duas telas no Xorg

Question

Eu tenho duas placas da Nvidia, mas o Xorg ativa apenas uma delas. A seguinte configuração é baseada na saída do configurador nvidia:

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

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

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

Section "InputDevice"
    Identifier     "Keyboard0"
    Driver         "keyboard"
EndSection

Section "Monitor"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "HP LE2201w"
    HorizSync       24.0 - 83.0
    VertRefresh     50.0 - 76.0
    Option         "DPMS"
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "Acer AL2017"
    HorizSync       30.0 - 82.0
    VertRefresh     56.0 - 76.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier  "Card0"
    Driver      "nvidia"
    VendorName  "nVidia Corporation"
    BoardName   "GeForce 6100 nForce 405"
    BusID       "PCI:0:13:0"
EndSection
Section "Device"
    Identifier  "Card1"
    Driver      "nvidia"
    VendorName  "nVidia Corporation"
    BoardName   "GeForce 8400 GS"
    BusID       "PCI:2:0:0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection
Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "nvidia-auto-select +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

O que eu vejo no arquivo de log é:

(==) Log file: "/var/log/Xorg.0.log", Time: Fri Mar 19 11:08:08 2010
(==) Using config file: "/etc/X11/xorg.conf"
(==) ServerLayout "Layout0"
(**) |-->Screen "Screen0" (0)
(**) |   |-->Monitor "Monitor0"
(==) No device specified for screen "Screen0".
        Using the first device section listed.
(**) |   |-->Device "Card0"
(**) |-->Screen "Screen1" (1)
(**) |   |-->Monitor "Monitor1"
(==) No device specified for screen "Screen1".
        Using the first device section listed.
(**) |   |-->Device "Card0"
(**) |-->Input Device "Keyboard0"
(**) |-->Input Device "Mouse0"
(**) Option "Xinerama" "0"
(==) Automatically adding devices
(==) Automatically enabling devices

mesmo que mais tarde os dois cartões sejam detectados:

(--) PCI:*(0:0:13:0) 10de:03d1:1019:2601 nVidia Corporation C61 [GeForce 6100 nForce 405] rev 162, Mem @ 0xfb000000/16777216, 0xd0000000/268435456, 0xfc000000/16777216, BIOS @ 0x????????/131072
(--) PCI: (0:2:0:0) 10de:0422:0000:0000 nVidia Corporation G86 [GeForce 8400 GS] rev 161, Mem @ 0xf8000000/16777216, 0xe0000000/268435456, 0xf6000000/33554432, I/O @ 0x0000bc00/128, BIOS @ 0x????????/131072
[ --- some more logs --- ]
(II) Mar 19 11:08:10 NVIDIA(0): NVIDIA GPU GeForce 6100 nForce 405 (C61) at PCI:0:13:0
(II) Mar 19 11:08:10 NVIDIA(0):     (GPU-0)
[ --- some more logs --- ]
(II) Mar 19 11:08:12 NVIDIA(GPU-1): NVIDIA GPU GeForce 8400 GS (G86) at PCI:2:0:0 (GPU-1)

Infelizmente, mais tarde, apenas um cartão é inicializado e uma tela está ativa. Xrandr mostra apenas uma tela também.

Alguma idéia de como corrigir isso?

    

Answer 1

As seções da tela não correspondem às seções do dispositivo que você definiu. Na primeira seção Screen (Screen0), a opção Device aponta para "Device0" - quando na primeira seção Device, você configura a opção Identifier para "Card0". As seções da tela precisam usar o identificador correto.

O que você quer ter aqui é:

Section "Device"
    Identifier  "Card0"
    ^^^^^^^^^^^^^^^^^^^  this line names this device "Card0"
    [...]
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Card0"
    ^^^^^^^^^^^^^^^^^^^^^^  this line needs to match a device's Identifier
    [...]
EndSection