nvidia-prime-switch-lightdm for nvidia or nvidia-390xx

This package is for optimus based laptops and allow switching between nvidia and intel card

intented for usage with lightdm

install either linux-Your_kernel_version(s)-nvidia module(s), nvidia-utils and lib32-nvidia-utils OR linux-Your_kernel_version(s)-nvidia-390xx module(s), lib32-nvidia-390xx-utils and nvidia-390xx-utils (because nvidia-utils and nvidia-390xx-utils are conflicting packages they're only optdepends.)

build package:

makepkg -sr

install afterwards with:

makepkg -i

Usage: After installation set either intel or nvidia or modesetting config

(e.g. sudo prime-switch -d intel)

Add own configs:

• dump default json configuration file (e.g. prime-switch -s ~/prime-switch-conf.json)
• create xorg config file (e.g. in /etc/X11/mhwd.d)
• open dumped json configuration file with text editor and add something like this:

        "nvidia_3Monitor": {
            "comment": "Own nvidia file for 3 Monitors",
            "xorg_file": "/etc/X11/mhwd.d/nvidia_3Mons.conf",
            "modules_load": [
                "nvidia",
                "nvidia-modeset",
                "nvidia-drm",
                "nvidia-uvm"
            ],
            "modules_blacklist": [
                "nouveau",
                "ttm"
            ],
            "modules_disable": [],
            "modules_options": [
                "nvidia-drm modeset=1"
            ]
        }

"nvidia_3Monitor" = id (used with prime-switch -d) "comment" = not needed, use for short info if needed "xorg_file" = path to xorg config file "modules_load" = modules to load (writes to /etc/modules-load.d/mhwd-gpu.conf) "modules_blacklist" = modules to blacklist (writes to /etc/modprobe.d/mhwd-gpu.conf) Note: blacklisted modules can still be loaded as dependency of another module "modules_disable" = modules to disable (writes to /etc/modprobe.d/mhwd-gpu.conf) Note: prevents loading of a module even if another module tries to load it "modules_options" = options for modules (writes to /etc/modprobe.d/mhwd-gpu.conf) Note: module name followed by option(s) e.g.: "modules_options": [ "i915 enable_rc6=7 enable_dc=1", "nvidia-drm modeset=1" ]

• use prime-switch command and set configuration sudo prime-switch -c ~/prime-switch-conf.json -d nvidia_3Monitor

(note: if you use prime-switch command with only -c path/to/json/file or without any parameter possible configurations are shown. They're also shown if you specifiy a configuration with -d parameter which doesnt exist)

Troubleshoot:

• check if symlink is correct (/etc/X11/xorg.conf.d/90-mhwd.conf should point to a xorg config file e.g. /etc/X11/mhwd.d/intel.conf)
• check with lspci if pci id's are correct in X intel and nvidia config files (note: xorg config file need correct format, e.g. 00:02:0 -> 0:2:0)
• check if xrandr commands in /etc/lightdm/display_setup.sh are present
• check if line display-setup-script in /etc/lightdm/lightdm.conf points to /etc/lightdm/display_setup.sh
• check for errors in xorg log ( if you start x org without root priviliges log file is in ~/.local/share/xorg/Xorg-DisplayNumber.log else in /var/log/Xorg.DisplayNumber.log )
• check if you have correct nvidia kernel module and nvidia-utils installed
• try the example nvidia config (adjust for your laptop)

For power saving: you can set with_udev=1 in PKGBUILD to include udev rule

or

create a additional config which disables nvidia modules (and blacklist/disable nouveau if you have nouveau installed) with intel config and add this udev rule (/etc/udev/rules.d): e.g.: 999-nvidia-gpu-power.rules:

SUBSYSTEM=="pci", DRIVER=="", ATTR{class}=="0x030000", ATTR{vendor}=="0x10de", ATTR{power/control}="auto"

(you probably can also remove the DRIVER match and set always "auto")

(adddtional you maybe need also turn off the gpu via acpi call)

(thanks to dglt who found this)

Files: /etc/X11/mhwd.d/intel-modesetting.conf: X config for modesetting

/etc/X11/mhwd.d/intel.conf: X config for intel gpu

/etc/X11/mhwd.d/nvidia.conf: X config for nvidia gpu

/etc/lightdm/display_setup.sh: contains xrandr commands

/etc/udev/rules.d/999-nvidia-gpu-power.rules: udev rule for setting power/control to "auto"

/usr/local/bin/prime-switch: python script for switching gpus

/usr/local/share/nvidia-prime-switch/prime-switch-conf.json: json configuration file for prime-switch

/usr/share/libalpm/hooks/nvidia-prime-displaymanager.hook: reminder to (re)install correct nvidia-prime package in case display manager changes

nvidia-prime-switch-lightdm.install: add/remove display-setup-script to/from /etc/lightdm/lightdm.conf