I'll check this:
--- mutter-48.1.orig/src/core/place.c 2025-04-01 14:41:18.000000000 +0200
+++ mutter-48.1/src/core/place.c 2025-07-29 19:45:00.853407108 +0200
@@ -201,6 +201,20 @@
*/
current = meta_backend_get_current_logical_monitor (backend);
+
+ if (!current) {
+ g_message ("ASSERTION WORKAROUND find_next_cascade");
+ MetaMonitorManager *monitor_manager =
+ meta_backend_get_monitor_manager (backend);
+
+ current =
+ meta_monitor_manager_get_primary_logical_monitor (monitor_manager);
+
+ if (!current) {
+ g_message ("ASSERTION WORKAROUND: NO LOGICAL MONITORS AT ALL
find_next_cascade");
+ return;
+ }
+ }
meta_window_get_work_area_for_logical_monitor (window, current, &work_area);
meta_window_get_frame_rect (window, &frame_rect);
@@ -990,6 +1004,21 @@
windows = find_windows_relevant_for_placement (window);
logical_monitor = meta_backend_get_current_logical_monitor (backend);
+ if (!logical_monitor)
+ {
+ g_message ("ASSERTION WORKAROUND");
+ MetaMonitorManager *monitor_manager =
+ meta_backend_get_monitor_manager (backend);
+
+ logical_monitor =
+ meta_monitor_manager_get_primary_logical_monitor (monitor_manager);
+
+ if (!logical_monitor) {
+ g_message ("ASSERTION WORKAROUND: NO LOGICAL MONITORS AT ALL");
+ goto done;
+ }
+ }
+
place_centered = window_place_centered (window);
if (place_centered)
because there was another meta_window_get_work_area_for_logical_monitor in
find_next_cascade
P.S.
yes, this mitigates issue, logs:
lip 29 19:52:52 F2A gnome-shell[3569]: [MUTTER DEBUG] Checking logical monitors
for point (4813,000000, 0,000000)
lip 29 19:52:52 F2A gnome-shell[3569]: [MUTTER DEBUG] Monitor: x=0 y=0
width=1920 height=1080
lip 29 19:52:52 F2A gnome-shell[3569]: [MUTTER DEBUG] Checking logical monitors
for point (4813,000000, 0,000000)
lip 29 19:52:52 F2A gnome-shell[3569]: [MUTTER DEBUG] Monitor: x=0 y=0
width=1920 height=1080
lip 29 19:52:52 F2A gnome-shell[3569]:
meta_monitor_manager_get_logical_monitor_from_number: assertion '(unsigned int)
number < g_list_length (manager->logical_monitors)' failed
lip 29 19:52:52 F2A gnome-shell[3569]:
meta_workspace_get_work_area_for_monitor: assertion 'logical_monitor != NULL'
failed
lip 29 19:52:52 F2A gnome-shell[3569]:
meta_monitor_manager_get_logical_monitor_from_number: assertion '(unsigned int)
number < g_list_length (manager->logical_monitors)' failed
lip 29 19:52:52 F2A gnome-shell[3569]:
meta_workspace_get_work_area_for_monitor: assertion 'logical_monitor != NULL'
failed
lip 29 19:52:52 F2A gnome-shell[3569]: [MUTTER DEBUG] Checking logical monitors
for point (4480,000000, 0,000000)
lip 29 19:52:52 F2A gnome-shell[3569]: [MUTTER DEBUG] Monitor: x=0 y=0
width=1920 height=1080
lip 29 19:52:52 F2A xdg-desktop-por[4107]: Monitor 'Dell Inc. 27"' has no
configuration which is-current!
lip 29 19:52:52 F2A xdg-desktop-por[4107]: Monitor 'Dell Inc. 27"' has no
configuration which is-current!
lip 29 19:52:52 F2A gnome-shell[3569]: meta_display_get_monitor_in_fullscreen:
assertion 'monitor >= 0 && monitor < n_logical_monitors' failed
lip 29 19:52:52 F2A gnome-shell[3569]:
meta_monitor_manager_get_logical_monitor_from_number: assertion '(unsigned int)
number < g_list_length (manager->logical_monitors)' failed
lip 29 19:52:52 F2A gnome-shell[3569]:
meta_workspace_get_work_area_for_monitor: assertion 'logical_monitor != NULL'
failed
lip 29 19:52:53 F2A gnome-shell[3569]: [MUTTER DEBUG] Checking logical monitors
for point (4480,000000, 0,000000)
lip 29 19:52:53 F2A gnome-shell[3569]: [MUTTER DEBUG] Monitor: x=0 y=0
width=1920 height=1080
lip 29 19:52:53 F2A gnome-shell[3569]: [MUTTER DEBUG] Checking logical monitors
for point (4480,000000, 0,000000)
lip 29 19:52:53 F2A gnome-shell[3569]: [MUTTER DEBUG] Monitor: x=0 y=0
width=1920 height=1080
lip 29 19:52:53 F2A gnome-shell[3569]: [MUTTER DEBUG] Checking logical monitors
for point (4480,000000, 0,000000)
lip 29 19:52:53 F2A gnome-shell[3569]: [MUTTER DEBUG] Monitor: x=0 y=0
width=1920 height=1080
lip 29 19:52:53 F2A gnome-shell[3569]: ASSERTION WORKAROUND
lip 29 19:52:53 F2A gnome-shell[3569]: [MUTTER DEBUG] Checking logical monitors
for point (4480,000000, 0,000000)
lip 29 19:52:53 F2A gnome-shell[3569]: [MUTTER DEBUG] Monitor: x=0 y=0
width=1920 height=1080
lip 29 19:52:53 F2A gnome-shell[3569]: ASSERTION WORKAROUND find_next_cascade
lip 29 19:52:53 F2A gnome-shell[3569]: Overwriting existing binding of keysym
39 with keysym 39 (keycode 12).
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https://bugs.launchpad.net/bugs/2117277
Title:
gnome-shell crash on unplugging external monitor –
meta_window_get_work_area_for_logical_monitor assertion
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https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2117277/+subscriptions
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