为 nvidia 信箱模式设置 xorg.conf 元模式

Question

我目前正在尝试将我的屏幕分辨率配置xorg.conf为小于显示器原始分辨率（1680x1050）的信箱模式，以便我可以全屏播放旧游戏而不会失真。我发现有一种方法可以做到这一点，即向 中添加元模式xorg.conf，但文档很少，所以我有点害怕在xorg.conf没有进一步输入的情况下开始乱搞。举个例子，假设我有一个以 的原始分辨率运行的游戏1024x768。我要添加什么才能使其居中并显示信箱模式？

这是我的xorg.conf：

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
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"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Unknown"
    HorizSync       28.0 - 33.0
    VertRefresh     43.0 - 72.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

以下几个链接可能会有用：

类似的问题：http://www.nvnews.net/vbulletin/showthread.php?t=184968

文档：http://us.download.nvidia.com/XFree86/Linux-x86_64/302.17/README/configtwinview.html#metamodes

谢谢！