nVidia with XWayland on EndeavourOS

cat /usr/lib/endeavouros-release
VERSION=2024.01.25

lsb_release -a
Distributor ID: EndeavourOS
Description:    EndeavourOS Linux

# clean online install on March 10, 2024 with KDE desktop

# https://discovery.endeavouros.com/nvidia/new-nvidia-driver-installer-nvidia-inst/2022/03/

nvidia-inst --drivers
NVIDIA card id: 13b0
Fetching driver data from nvidia.com ...
Series 550: supported (nvidia.com: 550.54.14)

nvidia-inst --series 550 -t
2024-03-11 00:11:38: Info: Running: nvidia-inst v23.1-1
2024-03-11 00:11:38: Info: Command line: nvidia-inst --series 550 -t
2024-03-11 00:11:38: Info: Selected mode: nvidia
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
COMMANDS TO RUN:
    ==> Looks like all requested packages and settings are already OK!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

inxi -xxxGz
Graphics:
  Device-1: NVIDIA GM107GLM [Quadro M2000M] vendor: Lenovo driver: nvidia
    v: 550.54.14 arch: Maxwell pcie: speed: 5 GT/s lanes: 16 ports: active: none
    off: eDP-1 empty: DP-1,DP-2,DP-3 bus-ID: 01:00.0 chip-ID: 10de:13b0
    class-ID: 0300
  Device-2: Lite-On Integrated Camera driver: uvcvideo type: USB rev: 2.0
    speed: 480 Mb/s lanes: 1 bus-ID: 1-8:2 chip-ID: 04ca:7058 class-ID: 0e02
  Display: wayland server: X.org v: 1.21.1.11 with: Xwayland v: 23.2.4
    compositor: kwin_wayland driver: X: loaded: nvidia unloaded: modesetting
    alternate: fbdev,nouveau,nv,vesa gpu: nvidia display-ID: 0
  Monitor-1: eDP-1 res: 1536x864 size: N/A modes: N/A
  API: EGL v: 1.5 hw: drv: nvidia platforms: device: 0 drv: nvidia device: 2
    drv: swrast gbm: drv: nvidia surfaceless: drv: nvidia wayland: drv: nvidia
    x11: drv: zink inactive: device-1
  API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 550.54.14
    glx-v: 1.4 direct-render: yes renderer: Quadro M2000M/PCIe/SSE2
    display-ID: :1.0
  API: Vulkan v: 1.3.279 layers: 1 surfaces: xcb,xlib,wayland device: 0
    type: discrete-gpu driver: nvidia device-ID: 10de:13b0

journalctl -xb -p3
March 10 23:50:43 host kwin_wayland[1443]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug
March 10 23:50:48 host kwin_wayland[1443]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug
March 10 23:50:53 host kwin_wayland[1443]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug
March 10 23:50:57 host kwin_wayland[1443]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug
March 10 23:51:02 host kwin_wayland[1443]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug
March 10 23:51:07 host kwin_wayland[1443]: kwin_wayland_drm: Pageflip timed out! This is a kernel bug
# sounds like this caused that 5-6 second delay during loading KDE desktop

uname -r
6.7.9-arch1-1
# Intel i7 x86_64 CPU

# issue:
# after login system will freeze for 5-6 seconds, then all works

# after suspend desktop is garbage and needs relogin to fix
# applied as suggested during nvidia driver installation but didn't help:
sudo systemctl enable --now nvidia-resume.service

# available services:
systemctl status nvidia-
nvidia-hibernate.service     nvidia-powerd.service        nvidia-suspend.service
nvidia-persistenced.service  nvidia-resume.service

# when enabled nvidia-suspend.service in addition to nvidia-resume.service, system freezed and later could disable that service on recovery console.
# after enabling service and rebooted, status is so:
systemctl status nvidia-resume.service
○ nvidia-resume.service - NVIDIA system resume actions
     Loaded: loaded (/usr/lib/systemd/system/nvidia-resume.service; enabled; preset: disabled)
     Active: inactive (dead)

# all services are inactive

echo $XDG_SESSION_TYPE
wayland

grep 'ExecStart=' /etc/systemd/system/display-manager.service
ExecStart=/usr/bin/sddm

systemctl status display-manager
● sddm.service - Simple Desktop Display Manager

systemctl --property=Id,Description show display-manager.service
Id=sddm.service
Description=Simple Desktop Display Manager

file /etc/systemd/system/display-manager.service
/etc/systemd/system/display-manager.service: symbolic link to /usr/lib/systemd/system/sddm.service

# SOLUTION
# ... is to use X11 instead of Wayland as Wayland is still not yet ready

/etc/sddm.conf.d/kde_settings.conf
# could be also /etc/sddm.conf or /etc/sddm.conf.d/sddm.conf
[Autologin]
Session=plasmax11
User=<user>
# here is plasmax11 instead of plasma

# also found that this could be also an option to set x11:
# /etc/sddm.conf.d/sddm.conf
# DisplayServer=x11
# (for wayland there could be wayland instead of x11)

# then reboot computer and check, what is running:
echo $XDG_SESSION_TYPE
x11
# X11 works currently better than Wayland:
# login faster, does not freeze on login for some seconds
# after resuming from suspend there are no glitches
# especially when you happen to have nVidia GPU
#
# hopefully will Wayland work fine in future
# so we can stick with Wayland,
# which promises to be way more flexible than X11