Xは起動時にモニタとレイアウトの設定を読み取りますが、xrandrはScreen0のみを表示します。

私は数日間アーチLinuxを設定してきました。ほとんどの場合、簡単に進みますが、マルチヘッドのサポートに実際の問題があります。

IntelおよびNVIDIAビデオチップとハイブリッドグラフィックスを備えたThinkpad X1 Extremeを使用しています。

私は以下をインストールしました：

• xf86-ビデオ-インテル
• xf86-ビデオ-vesa
• カボチャ
• BBスイッチ
• 光DM
• i3wm

これは私が使っているxorgconfです：

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

Section "Module"
    Load           "dbe"
    Load           "extmod"
    Load           "type1"
    Load           "freetype"
    Load           "glx"
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         "keyboard"
EndSection
Section "Device"
    Identifier  "intelgpu0"
    Driver      "intel"
    Screen      0
    Option      "XvMC" "true"
    Option      "UseEvents" "true"
    Option      "AccelMethod" "UXA"
    BusID       "PCI:00:02:0"
EndSection

Section "Device"
    Identifier  "intelgpu1"
    Driver      "intel"
    Screen      1
    Option      "XvMC" "true"
    Option      "UseEvents" "true"
    Option      "AccelMethod" "UXA"
    BusID       "PCI:00:02:0"
EndSection

Section "Device"
    Identifier  "nvidiagpu0"
    Driver      "nvidia"
    BusID       "PCI:01:00:0"
EndSection

Section "Monitor"
    Identifier  "Monitor0"
    Option      "Enable" "true"
EndSection

Section "Monitor"
    Identifier  "Monitor1"
    Option      "Enable" "true"
EndSection

Section "Screen"
    Identifier  "Screen0"
    Device      "intelgpu0"
    Monitor     "Monitor0"
    DefaultDepth    24
    Option      "TwinView" "0"
    SubSection "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier  "Screen1"
    Device      "intelgpu1"
    Monitor     "Monitor1"
    DefaultDepth    24
    Option      "TwinView" "0"
    SubSection "Display"
        Depth       24
    EndSubSection
EndSection

以下は、両方のビデオデバイスのlspci -v出力です。

00:02.0 VGA compatible controller: Intel Corporation Device 3e9b (prog-if 00 [VGA controller])
    Subsystem: Lenovo Device 2267
    Flags: bus master, fast devsel, latency 0, IRQ 171
    Memory at 404a000000 (64-bit, non-prefetchable) [size=16M]
    Memory at 80000000 (64-bit, prefetchable) [size=256M]
    I/O ports at 6000 [size=64]
    [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
    Capabilities: <access denied>
    Kernel driver in use: i915
    Kernel modules: i915

01:00.0 VGA compatible controller: NVIDIA Corporation GP107M [GeForce GTX 1050 Ti Mobile] (rev a1) (prog-if 00 [VGA controller])
    Subsystem: Lenovo GP107M [GeForce GTX 1050 Ti Mobile]
    Flags: bus master, fast devsel, latency 0, IRQ 16
    Memory at bf000000 (32-bit, non-prefetchable) [size=16M]
    Memory at 60000000 (64-bit, prefetchable) [size=256M]
    Memory at 70000000 (64-bit, prefetchable) [size=32M]
    I/O ports at 5000 [size=128]
    Expansion ROM at c0000000 [disabled] [size=512K]
    Capabilities: <access denied>
    Kernel driver in use: nvidia
    Kernel modules: nouveau, nvidia_drm, nvidia

Xを実行するとレイアウトと画面がうまく選択されているようです（以前は最初の画面セクションを読むのが難しかった）。

[     2.312] (==) Using config directory: "/etc/X11/xorg.conf.d"
[     2.312] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[     2.314] (==) ServerLayout "Layout0"
[     2.314] (**) |-->Screen "Screen0" (0)
[     2.314] (**) |   |-->Monitor "Monitor0"
[     2.315] (**) |   |-->Device "intelgpu0"
[     2.315] (**) |-->Screen "Screen1" (1)
[     2.315] (**) |   |-->Monitor "Monitor1"
[     2.315] (**) |   |-->Device "intelgpu1"
[     2.315] (**) |-->Input Device "Mouse0"
[     2.315] (**) |-->Input Device "Keyboard0"
[     2.315] (==) Automatically adding devices
[     2.315] (==) Automatically enabling devices
[     2.315] (==) Automatically adding GPU devices
[     2.315] (==) Automatically binding GPU devices

（フルXorg.0.logのPastebin)

bbswitchにはいくつかの問題がありますが、両方のビデオデバイスを認識して管理できるようです。

[    2.272033] bbswitch: loading out-of-tree module taints kernel.
[    2.272053] bbswitch: module verification failed: signature and/or required key missing - tainting kernel
[    2.272220] bbswitch: version 0.8
[    2.272238] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
[    2.272243] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
[    2.272435] bbswitch: detected an Optimus _DSM function
[    2.272526] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
[    2.276310] bbswitch: disabling discrete graphics

（フル出力のdmesg Pastebin)

xrandrただし、依然としてxrandr --listproviders1つの画面と1つのプロバイダのみが表示されます。

$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
   1920x1080     60.03*+  59.96    59.93    47.99  
   1680x1050     59.95    59.88  
   ...

$ xrandr --listproviders
Providers: number : 1
Provider 0: id: 0x43 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 3 outputs: 1 associated providers: 0 name:Intel

起動後に出力が使用できないため、xrandrを使用してモニターを開いたり移動したりすることはできません（モニターが接続されているかどうかにかかわらず）。