After disabling a laptop's built in screen in lieu of an external screen, suspending to RAM, and then waking it up, sometimes the default screen will mirror the external screen. The mouse will be locked to the center of the laptop's screen. It is necessary to go to the Display Settings dialog and check and then uncheck the laptop's internal monitor.
I've experienced this at the login prompt, which can be very irritating. Somehow I regained the ability to login despite my mouse being locked at the center of my external monitor. Xubuntu 17.10 Dell XPS 13 9360 DE laptop Intel HD 620 GPU LG 27UD58P-B External monitor connected via Thunderbolt 3 to Display Port cable xfce4-settings: 4.12.1-1ubuntu1 Kernel: 4.13.0-15-generic #16-Ubuntu SMP Wed Oct 4 21:59:25 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
The cursor appears frozen on the external monitor but does move on the built in monitor. All of the GUI on the external monitor updates properly except for the cursor.
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