GNOME Shell crashes with "assertion failed: (logical_monitor)" when displays are off

Description

GNOME Shell crashes consistently when displays are turned off (DPMS off), causing the session to logout and return to the login screen.

Environment

• GNOME Shell: 46.0
• Tiling Assistant: v46 (Ubuntu package) and v48 (user-installed)
• OS: Ubuntu 24.04
• Kernel: 6.8.0-85-generic
• GPU: NVIDIA (using proprietary drivers)
• Display setup:
  • Primary: 3840x2160 (DP-0.8)
  • Secondary: 1440x2560 rotated right (DP-0.1.1)

Steps to Reproduce

1. Have dual monitor setup with tiling-assistant enabled
2. Turn off displays (DPMS) for several hours (e.g., overnight)
3. System crashes and returns to login screen

Crash Pattern

• Crashes occur consistently during periods when displays are off
• Always occurs at similar times (between 02:00-05:00 and 15:00)
• Has occurred 7 times in the past week

Error Details

libmutter:ERROR:../src/core/window.c:5937:meta_window_get_work_area_for_logical_monitor: assertion failed: (logical_monitor)
GNOME Shell crashed with signal 6

Stack trace (from user-installed v48):

#0 tilingWindowManager.js:138
#1 tilingWindowManager.js:1365
#2 tilingWindowManager.js:471

Stack trace (from Ubuntu v46):

#0 tilingWindowManager.js:99
#1 tilingWindowManager.js:1303
#2 tilingWindowManager.js:437

Related Issues

Possibly related to #323 and #406 regarding display state changes.

Additional Notes

The crash happens with both the user-installed version and the Ubuntu-packaged version, suggesting this is a core issue with how the extension handles monitor state changes when displays are powered off.

Start with tilingWindowManager.js at the reported stack-trace locations, including lines 138/1365/471 and 99/1303/437, and review related issues #323 and #406 for display-state changes. Reproduce the dual-monitor DPMS-off scenario and trace the path leading to the logical_monitor assertion; done means displays can remain off without GNOME Shell crashing.