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+# identify virtio graphics cards to find passthrough setups
+SUBSYSTEM!="virtio", GOTO="gdm_virtio_device_end"
+ACTION!="add", GOTO="gdm_virtio_device_end"
+ATTR{vendor}=="0x1af4", ATTR{device}=="0x0010", RUN+="/usr/bin/touch /run/udev/gdm-machine-has-virtual-gpu", ENV{GDM_MACHINE_HAS_VIRTUAL_GPU}="1", GOTO="gdm_virtio_device_end"
+LABEL="gdm_virtio_device_end"
+
+SUBSYSTEM!="pci", GOTO="gdm_pci_device_end"
+ACTION!="bind", GOTO="gdm_pci_device_end"
+
+# identify virtio graphics cards to find passthrough setups
+# cirrus
+ATTR{vendor}=="0x1013", ATTR{device}=="0x00b8", ATTR{subsystem_vendor}=="0x1af4", ATTR{subsystem_device}=="0x1100", RUN+="/usr/bin/touch /run/udev/gdm-machine-has-virtual-gpu", ENV{GDM_MACHINE_HAS_VIRTUAL_GPU}="1", GOTO="gdm_pci_device_end"
+# vga
+ATTR{vendor}=="0x1b36", ATTR{device}=="0x0100", RUN+="/usr/bin/touch /run/udev/gdm-machine-has-virtual-gpu", ENV{GDM_MACHINE_HAS_VIRTUAL_GPU}="1", GOTO="gdm_pci_device_end"
+# qxl
+ATTR{vendor}=="0x1234", ATTR{device}=="0x1111", RUN+="/usr/bin/touch /run/udev/gdm-machine-has-virtual-gpu", ENV{GDM_MACHINE_HAS_VIRTUAL_GPU}="1", GOTO="gdm_pci_device_end"
+
+# disable Wayland on Hi1710 chipsets
+ATTR{vendor}=="0x19e5", ATTR{device}=="0x1711", GOTO="gdm_disable_wayland"
+
+# disable Wayland on Matrox chipsets
+ATTR{vendor}=="0x102b", ATTR{device}=="0x0522", GOTO="gdm_disable_wayland"
+ATTR{vendor}=="0x102b", ATTR{device}=="0x0524", GOTO="gdm_disable_wayland"
+ATTR{vendor}=="0x102b", ATTR{device}=="0x0530", GOTO="gdm_disable_wayland"
+ATTR{vendor}=="0x102b", ATTR{device}=="0x0532", GOTO="gdm_disable_wayland"
+ATTR{vendor}=="0x102b", ATTR{device}=="0x0533", GOTO="gdm_disable_wayland"
+ATTR{vendor}=="0x102b", ATTR{device}=="0x0534", GOTO="gdm_disable_wayland"
+ATTR{vendor}=="0x102b", ATTR{device}=="0x0536", GOTO="gdm_disable_wayland"
+ATTR{vendor}=="0x102b", ATTR{device}=="0x0538", GOTO="gdm_disable_wayland"
+
+# disable Wayland on aspeed chipsets
+ATTR{vendor}=="0x1a03", ATTR{device}=="0x2010", GOTO="gdm_disable_wayland"
+ATTR{vendor}=="0x1a03", ATTR{device}=="0x2000", GOTO="gdm_disable_wayland"
+
+LABEL="gdm_pci_device_end"
+
+# disable Wayland if modesetting is disabled
+KERNEL!="card[0-9]*", GOTO="gdm_nomodeset_end"
+SUBSYSTEM!="drm", GOTO="gdm_nomodeset_end"
+IMPORT{parent}="GDM_MACHINE_HAS_VIRTUAL_GPU"
+ENV{GDM_MACHINE_HAS_VIRTUAL_GPU}!="1", RUN+="/usr/bin/touch /run/udev/gdm-machine-has-hardware-gpu"
+# but keep it enabled for simple framebuffer drivers
+DRIVERS=="simple-framebuffer", GOTO="gdm_nomodeset_end"
+IMPORT{cmdline}="nomodeset", GOTO="gdm_disable_wayland"
+LABEL="gdm_nomodeset_end"
+
+# The vendor nvidia driver has multiple modules that need to be loaded before GDM can make an
+# informed choice on which way to proceed, so force GDM to wait until NVidia's modules are
+# loaded before starting up.
+KERNEL!="nvidia", GOTO="gdm_nvidia_end"
+SUBSYSTEM!="module", GOTO="gdm_nvidia_end"
+ACTION!="add", GOTO="gdm_nvidia_end"
+RUN+="/usr/bin/touch /run/udev/gdm-machine-has-vendor-nvidia-driver"
+
+# Check if suspend/resume services necessary for working wayland support is available
+TEST{0711}!="/usr/bin/nvidia-sleep.sh", GOTO="gdm_disable_wayland"
+TEST{0711}!="/usr/lib/systemd/system-sleep/nvidia", GOTO="gdm_disable_wayland"
+IMPORT{program}="/bin/sh -c \"sed -e 's/: /=/g' -e 's/\([^[:upper:]]\)\([[:upper:]]\)/\1_\2/g' -e 's/[[:lower:]]/\U&/g' -e 's/^/NVIDIA_/' /proc/driver/nvidia/params\""
+ENV{NVIDIA_PRESERVE_VIDEO_MEMORY_ALLOCATIONS}!="1", GOTO="gdm_disable_wayland"
+IMPORT{program}="/bin/sh -c 'echo NVIDIA_HIBERNATE=`systemctl is-enabled nvidia-hibernate`'"
+ENV{NVIDIA_HIBERNATE}!="enabled", GOTO="gdm_disable_wayland"
+IMPORT{program}="/bin/sh -c 'echo NVIDIA_RESUME=`systemctl is-enabled nvidia-resume`'"
+ENV{NVIDIA_RESUME}!="enabled", GOTO="gdm_disable_wayland"
+IMPORT{program}="/bin/sh -c 'echo NVIDIA_SUSPEND=`systemctl is-enabled nvidia-suspend`'"
+ENV{NVIDIA_SUSPEND}!="enabled", GOTO="gdm_disable_wayland"
+LABEL="gdm_nvidia_end"
+
+# If this machine has an internal panel, take note, since it's probably a laptop
+# FIXME: It could be "ghost connectors" make this pop positive for some workstations
+# in the wild. If so, we may have to fallback to looking at the chassis type from
+# dmi data or acpi
+KERNEL!="card[0-9]-eDP-*", GOTO="gdm_laptop_check_end"
+SUBSYSTEM!="drm", GOTO="gdm_laptop_check_end"
+ACTION!="add", GOTO="gdm_laptop_check_end"
+RUN+="/usr/bin/touch /run/udev/gdm-machine-is-laptop"
+GOTO="gdm_hybrid_nvidia_laptop_check"
+LABEL="gdm_laptop_check_end"
+
+# If this is a hybrid graphics setup, take note
+KERNEL!="card[1-9]*", GOTO="gdm_hybrid_graphics_check_end"
+KERNEL=="card[1-9]-*", GOTO="gdm_hybrid_graphics_check_end"
+SUBSYSTEM!="drm", GOTO="gdm_hybrid_graphics_check_end"
+ACTION!="add", GOTO="gdm_hybrid_graphics_check_end"
+RUN+="/usr/bin/touch /run/udev/gdm-machine-has-hybrid-graphics"
+LABEL="gdm_hybrid_graphics_check_end"
+
+# If this is a hybrid graphics laptop with vendor nvidia driver, disable wayland
+LABEL="gdm_hybrid_nvidia_laptop_check"
+TEST!="/run/udev/gdm-machine-is-laptop", GOTO="gdm_hybrid_nvidia_laptop_check_end"
+TEST!="/run/udev/gdm-machine-has-hybrid-graphics", GOTO="gdm_hybrid_nvidia_laptop_check_end"
+TEST!="/run/udev/gdm-machine-has-vendor-nvidia-driver", GOTO="gdm_hybrid_nvidia_laptop_check_end"
+GOTO="gdm_disable_wayland"
+LABEL="gdm_hybrid_nvidia_laptop_check_end"
+
+# Disable wayland in situation where we're in a guest with a virtual gpu and host passthrough gpu
+LABEL="gdm_virt_passthrough_check"
+TEST!="/run/udev/gdm-machine-has-hybrid-graphics", GOTO="gdm_virt_passthrough_check_end"
+TEST!="/run/udev/gdm-machine-has-virtual-gpu", GOTO="gdm_virt_passthrough_check_end"
+TEST!="/run/udev/gdm-machine-has-hardware-gpu", GOTO="gdm_virt_passthrough_check_end"
+GOTO="gdm_disable_wayland"
+LABEL="gdm_virt_passthrough_check_end"
+
+# Disable wayland when there are multiple virtual gpus
+LABEL="gdm_virt_multi_gpu_check"
+TEST!="/run/udev/gdm-machine-has-hybrid-graphics", GOTO="gdm_virt_multi_gpu_check_end"
+TEST!="/run/udev/gdm-machine-has-virtual-gpu", GOTO="gdm_virt_multi_gpu_check_end"
+TEST=="/run/udev/gdm-machine-has-hardware-gpu", GOTO="gdm_virt_multi_gpu_check_end"
+LABEL="gdm_virt_multi_gpu_check_end"
+
+# Disable wayland when nvidia modeset is disabled or when drivers are a lower
+# version than 470,
+# For versions above 470 but lower than 510 prefer Xorg,
+# Above 510, prefer Wayland.
+KERNEL!="nvidia_drm", GOTO="gdm_nvidia_drm_end"
+SUBSYSTEM!="module", GOTO="gdm_nvidia_drm_end"
+ACTION!="add", GOTO="gdm_nvidia_drm_end"
+# disable wayland if nvidia-drm modeset is not enabled
+ATTR{parameters/modeset}!="Y", GOTO="gdm_disable_wayland"
+# disable wayland for nvidia drivers versions lower than 470
+ATTR{version}=="4[0-6][0-9].*|[0-3][0-9][0-9].*|[0-9][0-9].*|[0-9].*", GOTO="gdm_disable_wayland"
+# For nvidia drivers versions Above 510, keep Wayland by default
+ATTR{version}=="[5-9][1-9][0-9].*", GOTO="gdm_end"
+# For nvidia drivers versions 470-495, prefer Xorg by default
+GOTO="gdm_prefer_xorg"
+LABEL="gdm_nvidia_drm_end"
+
+GOTO="gdm_end"
+
+LABEL="gdm_prefer_xorg"
+RUN+="@libexecdir@/gdm-runtime-config set daemon PreferredDisplayServer xorg"
+GOTO="gdm_end"
+
+LABEL="gdm_disable_wayland"
+RUN+="@libexecdir@/gdm-runtime-config set daemon WaylandEnable false"
+GOTO="gdm_end"
+
+LABEL="gdm_end"
+