What you will achieve

Know whether your session runs Wayland or X11, why it matters for screen sharing and GPU, and how to switch on Ubuntu/Fedora GNOME.

1) Detect session type

echo $XDG_SESSION_TYPE
loginctl show-session $(loginctl | awk 'NR==2{print $1}') -p Type

2) GNOME login toggle

On GDM login screen → gear icon → Ubuntu (Wayland) vs Ubuntu on Xorg.

3) Practical differences

Wayland — better isolation, fractional scaling; some legacy X apps need XWayland.
X11 — broader compatibility for remote desktop and older screen capture tools.
NVIDIA — check driver docs; recent drivers improved Wayland on GNOME.

4) Force X11 (temporary)

# GDM custom.conf uncomment:
# WaylandEnable=false

Verify

echo $WAYLAND_DISPLAY
echo $DISPLAY

Wayland sets WAYLAND_DISPLAY=wayland-0; X11 sets DISPLAY=:0.

5) Screen sharing on Wayland

PipeWire and xdg-desktop-portal required for Zoom/Teams screen share on Wayland GNOME — install xdg-desktop-portal-gnome.

6) Remote desktop

RDP (xrdp) and VNC historically target X11. Wayland sessions may need different tools (RustDesk, GNOME Remote Desktop).

7) Variable refresh and gaming

Wayland compositors handle VRR better on KDE Plasma 6 and recent GNOME — check distro release notes for your GPU.

Check app compatibility

echo $XDG_SESSION_TYPE
glxinfo | grep "OpenGL renderer"

Proprietary apps still shipping X11-only may need GDK_BACKEND=x11 workaround until ported.

8) Headless servers irrelevant

Neither Wayland nor X11 applies to typical Ubuntu Server — saves you debugging session type on SSH-only boxes.

Prerequisites

Desktop environment installed (GNOME/KDE). GPU drivers current. Knowledge of whether remote desktop and screen sharing are daily requirements — drives X11 vs Wayland choice.

logind seat

loginctl show-session $(loginctl | awk 'NR==2{print $1}') -p Type

KDE Plasma Wayland session

SDDM login → Plasma (Wayland) vs Plasma (X11) — KDE maturity on Wayland differs from GNOME; pick per app compatibility testing.

Fractional scaling

Wayland GNOME 46+ improved 125%/150% scaling — X11 fractional scaling hacky. Laptops with HiDPI favour Wayland session when apps you use support it — test Zoom/Teams screen share before committing.

Steam and games

Proton and native games mix XWayland and Vulkan — Gamemode and correct session type affect frame pacing — check ProtonDB game notes for Wayland-specific bugs before switching session permanently.

obs studio capture

OBS 30+ native Wayland pipewire capture — X11 obs needs xcomposite. Streamers pick session type based on capture pipeline not ideology.

mutter vs kwin

GNOME mutter and KDE kwin compositors differ in Wayland maturity — app works on Fedora KDE Wayland may break on Ubuntu GNOME — test your stack not generic Wayland advice.