NVIDIA SLI不工作

Question

几天前我安装了一个新的Ubuntu 20.04。

我安装了一个NVIDIA驱动程序，一切都运行得很好。

现在我想设置SLI。我插入了我的第二个GPU和SLI桥：

要启用SLI，我运行以下命令

sudo nvidia-xconfig --sli=on

现在，cat /etc/X11/xorg.conf的输出是：

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 440.64

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 440.64

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"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "BenQ EX3501R"
    HorizSync       28.0 - 155.0
    VertRefresh     48.0 - 100.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce GTX 970"
EndSection

Section "Screen"

# Removed Option "SLI" "on"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-1"
    Option         "metamodes" "3440x1440_100 +0+0"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    Option         "SLI" "AFR"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

这两个GPU都被NVIDIA X服务器设置所识别

但是即使在重新启动之后，SLI似乎也没有启用。当我执行GPU密集型任务时，GPU 0的GPU Utilization增加，但GPU 1保持在0%。

GPU 0

GPU 1

这是我的系统信息

SLI桥

Answer 1

试一试

sudo xconfig -sli = on -multigpu = on

或

sudo xconfig -sli = auto -multigpu = auto