Abnormal sleep state

[Liang-zy]

Version: 20.04LTS
Test environment: ThinkPad X1
Test steps:
1.ctrl+alt+delete click sleep
2. Press the power button to wake up the system
expected results:
Step 1 The system goes to sleep
Step 2 wake up the system normally
actual results:
Step 1 After clicking sleep, the screen will be black first and then the desktop will be displayed before entering sleep state
Step 2 After waking up the system, what you get is the boot login interface, not the lock screen login interface, and the state before the user sleep will not be saved