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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11To check whether an individual app is using X11 in a Wayland desktop session, run xlsclients -l and look for the app. A listed app has an X11 connection, usually through Xwayland. The session type alone cannot tell you how every app is running: a Wayland desktop can host both native Wayland apps and X11 apps via Xwayland.
Why the desktop session does not identify an app’s protocol
Wayland and X11 can coexist on the same desktop. An X11 application connects to Xwayland as it would to an X server; Xwayland, in turn, is a Wayland client connected to the compositor. That means a session-wide setting such as XDG_SESSION_TYPE=wayland identifies the desktop session, not the protocol used by a particular window. See the Wayland documentation for this relationship.
Check an app from the desktop
Use xlsclients -l for a quick positive check
Run xlsclients -l in a terminal. The X.Org utility lists client applications connected to the selected or default X display; -l requests long-format output. If the target app appears, it has an X11 connection and, in a Wayland session, is typically running through Xwayland. The X.Org manual describes the command and its display-oriented scope.
This is a positive check, not a universal test for native Wayland. The result depends on which X display is queried, and an app may not appear because of its display connection or architecture. Do not treat absence from the list as proof that it is native Wayland.
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Try an interactive window check
If you want to inspect a particular window, ArchWiki suggests running xwininfo and selecting it, or running xeyes and seeing whether the pupils track the pointer over the app. These are practical X11-side clues, not guaranteed protocol detectors: behavior can vary with the compositor, toolkit, and window structure. The utilities may also need to be installed separately, depending on your Linux distribution. See the ArchWiki guidance on GUI applications.
Use toolkit information for a more precise check
Qt applications: inspect the QPA platform
For a Qt app, its platform plugin is the relevant toolkit-level detail. Qt documents qxcb as its X11 platform plugin and provides QT_QPA_PLATFORM and the -platform argument to override platform selection. Check the app’s launch configuration when debugging; an override indicates what was requested, not necessarily what the running app successfully initialized. Qt may also try a semicolon-separated list of available plugins. For details, see the Qt 6.12 QPA documentation.
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For software using GDK, the application can inspect its display object at runtime to determine whether it is a Wayland display (GdkWaylandDisplay) or an X11 display. This is a developer-facing check and does not apply to arbitrary applications. GDK’s documentation also notes that backend-specific APIs can depend on both compile-time and runtime backend availability. See the GDK 4 API documentation.
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Which check should you use?
| Method | Scope | Best use | Limitation |
|---|---|---|---|
xlsclients -l |
X clients on the selected or default X display | Quick positive check for an app with an X11 connection | Display selection and listing scope matter; absence is not conclusive. Source: X.Org manual. |
xwininfo or xeyes |
Interactively selected or hovered window | User-facing spot check | Interaction can vary across environments. Source: ArchWiki. |
| Qt QPA inspection | Qt application | Debugging the platform plugin used by a Qt app | Qt-specific; a launch override alone does not confirm successful runtime initialization. Source: Qt documentation. |
| GDK display-object check | GTK/GDK application | Runtime check in application code | GDK-specific and primarily for developers. Source: GDK documentation. |
How to interpret the result
- If
xlsclients -llists the app, it is using an X11 connection; under Wayland, that typically means Xwayland. - If the app is absent, the result is inconclusive. Check that you are querying the appropriate X display, or use the app’s own toolkit runtime information if available.
- For Qt or GDK apps, prefer a runtime backend observation over a session variable or launch preference when you need to know what the app actually initialized.
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