I have disabled all Gnome extensions. I have not seen anything today. It will take time to know if it suffices.
Indeed I have already posted a relevant log there:
Therein something related to monitor:
meta_monitor_manager_get_monitor_for_connect
Googling for this:
https://bugzilla.redhat.com/show_bug.cgi?id=2255486
I enabled a display in settings that I had previously disabled.
Related to the fact that I have no problem if external monitor is off.
I could find out the log from yesterday:
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Queued start job for default target Main User >
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Created slice User Application Slice.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Reached target Paths.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Reached target Timers.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Starting D-Bus User Message Bus Socket...
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Listening on GnuPG network certificate managem>
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Listening on GCR ssh-agent wrapper.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Listening on GNOME Keyring daemon.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Listening on GnuPG cryptographic agent and pas>
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Listening on GnuPG cryptographic agent and pas>
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Listening on GnuPG cryptographic agent (ssh-ag>
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Listening on GnuPG cryptographic agent and pas>
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Listening on GnuPG public key management servi>
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Listening on p11-kit server.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Listening on PipeWire Multimedia System Socket>
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Listening on Sound System.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Listening on D-Bus User Message Bus Socket.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Reached target Sockets.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Reached target Basic System.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Starting Update XDG user dir configuration...
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Started GNOME Keyring daemon.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Finished Update XDG user dir configuration.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Reached target Main User Target.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Startup finished in 282ms.
Feb 08 19:06:56 mac2011-manjaro gnome-keyring-daemon[1198]: GNOME_KEYRING_CONTROL=/run/user/1>
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Created slice User Core Session Slice.
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Starting D-Bus User Message Bus...
Feb 08 19:06:56 mac2011-manjaro dbus-broker-launch[1207]: Policy to allow eavesdropping in /u>
Feb 08 19:06:56 mac2011-manjaro systemd[1185]: Started D-Bus User Message Bus.
Feb 08 19:06:56 mac2011-manjaro dbus-broker-launch[1207]: Policy to allow eavesdropping in /u>
Feb 08 19:06:56 mac2011-manjaro dbus-broker-launch[1207]: Ready
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: _XSERVTransSocketUNIXCreateList>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: _XSERVTransMakeAllCOTSServerLis>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (--) Log file renamed from "/ho>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: X.Org X Server 1.21.1.10
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: X Protocol Version 11, Revision>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: Current Operating System: Linux>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: Kernel command line: BOOT_IMAGE>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]:
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: Current version of pixman: 0.43>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: Before reporting proble>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: to make sure that you h>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: Markers: (--) probed, (**) from>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (++) from command line,>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (WW) warning, (EE) erro>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (==) Log file: "/home/alba/.loc>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (==) Using config directory: "/>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (==) Using system config direct>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (==) No Layout section. Using >
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (==) No screen section availabl>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (**) |-->Screen "Default Screen>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (**) | |-->Monitor "<default >
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (==) No monitor specified for s>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: Using a default monitor>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (==) Automatically adding devic>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (==) Automatically enabling dev>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (==) Automatically adding GPU d>
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (==) Automatically binding GPU >
Feb 08 19:06:57 mac2011-manjaro /usr/lib/gdm-x-session[1221]: (==) Max clients allowed: 256, >
...skipping...
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: meta_monitor_manager_get_logical_monitor_f>
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: meta_workspace_get_work_area_for_monitor: >
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:17 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro google-chrome.desktop[1529]: [1496:1496:0208/201418.372034:ER>
Feb 08 20:14:18 mac2011-manjaro google-chrome.desktop[1529]: [1496:1496:0208/201418.378308:ER>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Can't update stage views actor <unnamed>[<>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Window manager warning: Overwriting existi>
Feb 08 20:14:18 mac2011-manjaro gnome-shell[1313]: Window manager warning: Overwriting existi>
First error lines:
meta_monitor_manager_get_logical_monitor_from_number: assertion '(unsigned int) number < g_list_length (manager->logical_monitors)' failed
meta_workspace_get_work_area_for_monitor: assertion 'logical_monitor != NULL' failed
Google leads to
The later points out the “Ubuntu Dock extension”.
I remember that in December I had problems with the Gnome extension Dash to Dock: for some time, it was marked oudated, so I tried similar extensions, Dash to Panel, Dock from Dash.
Also yesterday, Dock to Dash was broken in the event, for the first time, a destructive effect.
Now what is the relation between Dock and external monitor? Maybe the handling of different workspaces.
Having seen no problem with all Gnome extensions disabled, I have tried to reenable all extensions and I had the black forced Logout again immediately (not after suspend and wake).
With only Dock to Dash enabled, I see the bug again.