Dual screen problem

[Liang-zy]

Version: 20.04 LTS
Test environment: ThinkPad X1 Dell 7060
Prerequisite: Dual screen display
Test steps:
Step 1. Connect an external 4K monitor. Open the control panel, set the 4K monitor as the main screen, modify the 4K screen resolution, close the main screen display, set the screen zoom to 200%, click "Apply", log out
Step 2. Connect two monitors with the same resolution through the control panel: a: turn off the monitor 1 application, log out and log in again; b: turn off the monitor 2 application log out and log in again; c: check the unified output application log out and log in again log in
Step 3. Connect two monitors with different resolutions through the control panel: a. Close the application of display 1 log out and log in again; b: close the application of display 2 log out and log in again; c: check the unified output application log out and log in
Expected results:
Step 1. The interface is normal after application
Step 2. abc takes effect immediately after application, and the previous settings should be saved after logout.
Step 3. abc takes effect immediately after application, and the previous settings should be saved after logout
actual results:
Step 1. After setting the screen, the application logs out and logs in, the screen displays abnormally
Step 2, Step 3. If the maximum resolution supported by the two monitors is the same, no matter what you set, it will be displayed as an extended screen after logging out. If the maximum resolutions supported by the two monitors are different, logging out will be a duplicate screen.