The Cinnamon power management settings on Mint have options to suspend OR lock my ThinkPad when the lid is closed but I can’t seem to find a way to make it do both.
Update: fixed
The Cinnamon power management settings on Mint have options to suspend OR lock my ThinkPad when the lid is closed but I can’t seem to find a way to make it do both.
Update: fixed
Do you have a screenlocker program installed and setup?
A quick search tells me that
cinnamon-screensaveris its name for Cinnamon.Perhaps you can also run
journalctl -fin a terminal and then click the lock button in the menu, to see if there is any error related to that at that moment.cinnamon-screensaver/zara,now 6.4.1+zara amd64 [installed]

I don’t see any errors at all.
Dec 08 23:17:01 Mint-Yoga CRON[10491]: (root) CMD (cd / && run-parts --report /etc/cron.hourly)
Dec 08 23:17:01 Mint-Yoga CRON[10490]: pam_unix(cron:session): session closed for user root
Dec 08 23:17:18 Mint-Yoga dbus-daemon[780]: [system] Activating via systemd: service name=‘org.freedesktop.hostname1’ unit=‘dbus-org.freedesktop.hostname1.service’ requested by ‘:1.190’ (uid=1000 pid=10482 comm=“/usr/bin/gnome-screenshot --gapplication-service” label=“unconfined”)
Dec 08 23:17:18 Mint-Yoga systemd[1]: Starting systemd-hostnamed.service - Hostname Service…
Dec 08 23:17:18 Mint-Yoga dbus-daemon[780]: [system] Successfully activated service ‘org.freedesktop.hostname1’
Dec 08 23:17:18 Mint-Yoga systemd[1]: Started systemd-hostnamed.service - Hostname Service.
Dec 08 23:17:51 Mint-Yoga systemd-resolved[723]: Clock change detected. Flushing caches.
Dec 08 23:17:51 Mint-Yoga systemd-timesyncd[733]: Contacted time server 185.125.190.57:123 (ntp.ubuntu.com).
Dec 08 23:17:51 Mint-Yoga systemd[1]: apt-daily.service - Daily apt download activities was skipped because of an unmet condition check (ConditionACPower=true).
Dec 08 23:18:09 Mint-Yoga systemd[1]: systemd-hostnamed.service: Deactivated successfully.
Yeah, nothing seems related to locking the screen.
Perhaps try some cinnamon related place and they might know how to get the related info (I haven’t used cinnamon).