Настройка nouveau/nvidia-open для работы бок о бок

1. Установить пакет: `nvidia-open` (он подтянет зависимости: `egl-gbm`  `egl-wayland2`  `egl-x11`  `nvidia-utils`).

2. Разблеклистить модули открытого драйвера, мы будем контролировать их через параметры загрузки.
```
ln -s /dev/null /etc/modprobe.d/nvidia-utils.conf
```

3. Создать файл `/etc/mkinitcpio-nvidia.conf`:
```
# vim:set ft=sh:
# MODULES
# The following modules are loaded before any boot hooks are run.
MODULES=(nvidia nvidia_modeset nvidia_uvm nvidia_drm)

# BINARIES
# This setting includes any additional binaries a given user may wish into the CPIO image.
BINARIES=()

# FILES
# This setting is similar to BINARIES above, however, files are added as-is and are not parsed in any way.
FILES=()

# HOOKS
# This is the most important setting control the modules and scripts added to the image, and what happens at boot time.
HOOKS=(systemd plymouth autodetect microcode keyboard sd-vconsole modconf block filesystems fsck)

# COMPRESSION
# Use this to compress the initramfs image. Options: cat, zstd, gzip, bzip2, lzma, xz, lzop, lz4
#COMPRESSION="zstd"

# COMPRESSION_OPTIONS
# Additional options for the compressor.
#COMPRESSION_OPTIONS=()

# MODULES_DECOMPRESS
# Decompress loadable kernel modules and their firmware during initramfs creation. Switch (yes/no).
#MODULES_DECOMPRESS="no"
```

4. Создать файл `/etc/systemd/system-environment-generators/10-gpu-driver-check.sh`:
```
#!/bin/sh
# Set env vars depending on the loaded gpu module
if lsmod | grep -q "^nvidia"; then
   echo "VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/nvidia_icd.json"
   echo "__EGL_VENDOR_LIBRARY_FILENAMES=/usr/share/glvnd/egl_vendor.d/10_nvidia.json"

   # Video acceleration
   echo "LIBVA_DRIVER_NAME=nvidia"
   echo "VDPAU_DRIVER=nvidia"

elif lsmod | grep -q "^nouveau"; then
   echo "VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/nouveau_icd.json"
   echo "__EGL_VENDOR_LIBRARY_FILENAMES=/usr/share/glvnd/egl_vendor.d/50_mesa.json"

   # Video acceleration
   echo "LIBVA_DRIVER_NAME=zink"
   echo "VDPAU_DRIVER=zink"
   # OpenCL
   echo "RUSTICL_ENABLE=zink"
fi
```

5. Отредактировать `/etc/mkinitcpio.d/linux.preset`:
```
# mkinitcpio preset file for the 'linux' package

#ALL_config="/etc/mkinitcpio.conf"
ALL_kver="/boot/vmlinuz-linux"
#ALL_kerneldest="/boot/vmlinuz-linux"

PRESETS=('default' 'nvidia') #'fallback')

#default_config="/etc/mkinitcpio.conf"
#default_image="/boot/initramfs-linux.img"
default_uki="/boot/EFI/Linux/arch-linux.efi"
default_options="modprobe.blacklist=nvidia,nvidia_drm,nvidia_modeset,nvidia_uvm" # blacklist proprietary driver modules

nvidia_config="/etc/mkinitcpio-nvidia.conf"
#nvidia_image="/boot/initramfs-linux-nvidia.img"
nvidia_uki="/boot/EFI/Linux/arch-linux-nvidia.efi"
nvidia_options="modprobe.blacklist=nouveau,nova_core,nova_drm" # blacklist open driver modules

#fallback_config="/etc/mkinitcpio.conf"
#fallback_image="/boot/initramfs-linux-fallback.img"
fallback_uki="/boot/EFI/Linux/arch-linux-fallback.efi"
fallback_options="-S autodetect"
```