Archlinux Nvidia

ArchLinux 配置 nvidia 独立显卡

按照 PRIME Render Offload 文档，安装新版本的 nvidia 驱动和 xorg，新版本的 xorg 安装包可以从 arch-xorg-server 构建。 修改配置文件 /etc/X11/xorg.conf ，主要添加

Section "ServerLayout"
  Identifier "layout"
  Option "AllowNVIDIAGPUScreens"
EndSection

完整配置如下:

xorg.conf
Section "ServerLayout"
        Identifier     "X.org Configured"
        Screen      0  "Screen0" 0 0
        #Screen      1  "Screen1" RightOf "Screen0"
        InputDevice    "Mouse0" "CorePointer"
        InputDevice    "Keyboard0" "CoreKeyboard"
        Option         "AllowNVIDIAGPUScreens"
EndSection

Section "Files"
        ModulePath   "/usr/lib/xorg/modules"
        ModulePath   "/usr/lib/modules/extramodules-ARCH"
        FontPath     "/usr/share/fonts/TTF"
        FontPath     "/usr/share/fonts/adobe-source-code-pro"
EndSection

Section "Module"
        Load  "glx"
        Load  "nvidia-drm"
EndSection

Section "InputDevice"
        Identifier  "Keyboard0"
        Driver      "kbd"
EndSection

Section "InputDevice"
        Identifier  "Mouse0"
        Driver      "mouse"
        Option	    "Protocol" "auto"
        Option	    "Device" "/dev/input/mice"
        Option	    "ZAxisMapping" "4 5 6 7"
EndSection

Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "Monitor Vendor"
        ModelName    "Monitor Model"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
        ### <percent>: "<f>%"
        ### [arg]: arg optional
        #Option     "SWcursor"           	# [<bool>]
        #Option     "kmsdev"             	# <str>
        #Option     "ShadowFB"           	# [<bool>]
        #Option     "AccelMethod"        	# <str>
        #Option     "PageFlip"           	# [<bool>]
        #Option     "ZaphodHeads"        	# <str>
        #Option     "DoubleShadow"       	# [<bool>]
        Option      "RenderAccel"               "1"
        Option      "DPMS"                      "1"
        Option      "RegistryDwords"            "EnableBrightnessControl=1"
        Identifier  "Card0"
        Driver      "modesetting"
        BusID       "PCI:0:2:0"
EndSection

Section "Device"
        Identifier  "Card1"
        Driver      "nvidia"
        BusID       "PCI:1:0:0"
        Option      "RenderAccel"               "1"
        Option      "DPMS"                      "1"
        Option      "RegistryDwords"            "EnableBrightnessControl=1"
        Option      "RegistryDwords"            "PowerMizerLevelAC=0x3"
        Option      "RegistryDwords"            "PowerMizerLevel=0x2"
        Option      "RegistryDwords"            "PerfLevelSrc=0x3333"
        Option      "OnDemandVBlankInterrupts"  "1"
EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Card0"
        Monitor    "Monitor0"
        SubSection "Display"
                Viewport   0 0
                Depth     1
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     4
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     8
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     15
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     16
        EndSubSection
        SubSection "Display"
                Viewport   0 0
                Depth     24
        EndSubSection
EndSection

安装好软件后需要重启电脑，开启桌面后执行 xrandr --listproviders ，应该可以看到如下结果:

Providers: number : 2
Provider 0: id: 0x1e0 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 3 outputs: 5 associated providers: 0 name:modesetting
Provider 1: id: 0x1b8 cap: 0x0 crtcs: 0 outputs: 0 associated providers: 0 name:NVIDIA-G0

如果只看到一条记录，那可能是 nvidia-drm 模块没有加载，需要手动加载一下:

modprobe nvidia-drm

重启 xorg 服务后应该看到两个 provider，执行 nvidia-smi 应该有如下结果

+-----------------------------------------------------------------------------+
| NVIDIA-SMI 435.21       Driver Version: 435.21       CUDA Version: 10.1     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce GTX 1050    Off  | 00000000:01:00.0 Off |                  N/A |
| N/A   34C    P8    N/A /  N/A |     36MiB /  4042MiB |      0%      Default |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
|    0      1243      G   /usr/lib/Xorg                                 36MiB |
+-----------------------------------------------------------------------------+

firefox webgl 配置独立显卡

默认情况下应用都使用集成显卡来运行，如果需要使用独立显卡，需要添加环境变量:

__NV_PRIME_RENDER_OFFLOAD=1 __GLX_VENDOR_LIBRARY_NAME=nvidia firefox

在 firefox 打开 about:support 页面，在 Graphics 下查看 WebGL 1 Driver Renderer ，如果发现如下报错:

WebGL creation failed: 
Refused to create native OpenGL context because of blacklist entry: FEATURE<sub>FAILURE</sub><sub>GLXTEST</sub><sub>FAILED</sub>
Exhausted GL driver options.

那可以打开 firefox 的 about:config 页面，修改 webgl.force-enable 为 true ，重启 firefox，应该就能看到 WebGL 1 Driver Renderer 显示的是独立显卡了。 打开 fishgl 可以测试 webgl。同时再执行 nvidia-smi 的话可以看到有 firefox 的进程。

Sun Sep 29, 2019 cheon