Thanks. There seems to be a recurring issue with a monitor vanishing from the known list of monitors:
de des. 16 10:44:51 laptop-dani-g gnome-shell[4343]: (../src/backends/meta-output.c:142):meta_output_get_monitor: runtime check failed: (priv->monitor) de des. 16 10:44:51 laptop-dani-g gnome-shell[4343]: (../src/backends/meta-output.c:142):meta_output_get_monitor: runtime check failed: (priv->monitor) ... de des. 16 10:44:57 laptop-dani-g gnome-shell[4343]: (../src/backends/meta-output.c:142):meta_output_get_monitor: runtime check failed: (priv->monitor) de des. 16 10:44:57 laptop-dani-g gnome-shell[4343]: meta_monitor_manager_get_logical_monitor_from_number: assertion '(unsigned int) number < g_list_length (manager->logical_monitors)' failed de des. 16 10:44:57 laptop-dani-g gnome-shell[4343]: meta_workspace_get_work_area_for_monitor: assertion 'logical_monitor != NULL' failed de des. 16 10:44:57 laptop-dani-g gnome-shell[4343]: meta_monitor_manager_get_logical_monitor_from_number: assertion '(unsigned int) number < g_list_length (manager->logical_monitors)' failed de des. 16 10:44:57 laptop-dani-g gnome-shell[4343]: meta_workspace_get_work_area_for_monitor: assertion 'logical_monitor != NULL' failed Although some of that I would say is undeniably a bug in Mutter (the compositor), because it should be tracking monitors with less confusing messages, what triggers it might be lower level. Lower level like the kernel or hardware is reporting the monitor as disconnected. The first thing I would try is to delete the monitor config (~/.config/monitors.xml) and log in again. Just in case the cause is some weird configuration and resetting to defaults avoids it. If that doesn't solve the problem then next I would try a new display cable, because those are often the issue: https://discourse.ubuntu.com/t/the-display-bug-we-cant-fix/57434 Avoiding HDMI completely is also advisable if you can get a USB-C to whatever adapter cable. This is because laptops often have cheap low quality HDMI ports and running the display signal though the USB-C port in Alt mode avoids that. ** Changed in: mutter (Ubuntu) Status: Incomplete => New ** Tags added: i915 ** Summary changed: - External screen black after sleep + [i915] External screen black after sleep ** Also affects: linux (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2136133 Title: [i915] External screen black after sleep To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2136133/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
