RDM Linux intermittently stops accepting keyboard and left-click input on GNOME Wayland

Environment:

• Remote Desktop Manager: 2026.2.1.4, official APT package
• Avalonia: 11.3.17
• OS: Ubuntu 24.04.4 LTS
• Kernel: 7.0.0-28-generic
• Desktop: GNOME Shell 46.0
• Session: Wayland; RDM runs through XWayland with GDK_BACKEND=x11
• GPU: Intel Iris Xe (i915) plus NVIDIA RTX 2000 Ada (nvidia)
• Display scaling: 100%, no fractional scaling
• Three monitors: 1920×1200 and two 2560×1440 displays

Description:

After RDM has been running for some time, the application intermittently stops accepting keyboard input and meaningful left-click actions.

Right-click still opens context menus. Left-clicking different tabs changes the File/Home/Edit/View/Administration ribbon contents, showing that pointer events and UI repainting still occur, but buttons and normal commands/terminal changes do not propagate. Embedded SSH terminals also stop accepting keyboard input. Restarting RDM temporarily restores normal operation.

Tests performed:

• Confirmed xdg-desktop-portal and GNOME portal services are healthy.
• Confirmed XWayland keyboard and pointer devices remain present.
• Disabled IBus only for RDM: no improvement.
• Toggled “Grab Keyboard Input”/magnet: no improvement.
• Forced X11 input focus to the main RDM window: no improvement.
• Sent Escape events to dismiss a possible hidden modal: no improvement.
• Verified there was no mapped hidden/modal top-level RDM window.
• Minimized/restored and forcibly remapped the main window: no improvement.
• Tested the Flatpak build with GNOME Platform 49: same issue.
• Downgraded to RDM 2026.1.2.4 / Avalonia 11.3.12: same issue.
• Restored 2026.2.1.4 afterward.

Observed X11 state during failure:

• Main RDM window remained mapped, responsive, and declared WM_HINTS input=True.
• X11 input focus could successfully be assigned to the main RDM window.
• The process remained alive and responsive.
• Therefore the failure appears internal to RDM/Avalonia input or command routing rather than loss of XWayland devices or compositor focus.

Expected behavior:

• RDM should continue accepting keyboard and left-click input without requiring the application and all open sessions to be restarted.