Failed to wake up after ubuntu is suspended

After ubuntu is suspended, it cannot be wakened. First, sudo apt-get install pm-utils to install this package. I recently learned about laptop_mode carefully and found that as long as the laptop_mode is enabled, the Laptop cannot be awakened after being suspended. About laptop_mode by default, you have installed the laptop-mode-tools toolkit after installing the system to your laptop. If you do not need to check whether you have installed the laptop-mode-tools toolkit, you can enter the following command in the terminal to check whether the tool is installed. Dpkg-l | grep laptop-mode-tools if your computer has no result output in the future, you can install it using the following commands. Sudo apt-get install laptop-mode-tools although the system has automatically installed laptop-mode-tools, does it enable the laptop_mode mode automatically? We use the following command to determine whether laptop_mode is enabled for Laptop. If the result is 0, it indicates that laptop_mode is not enabled. If it is not 0, it indicates that Laptop is started. How does cat/proc/sys/vm/laptop_mode start the laptop_mode mode? 1. modify the configuration file/etc/default/acpi-support and change ENABLE_LAPTOP_MODE = true sudo gedit/etc/default/acpi-support 2. then, by default, the UBUNTU system will start laptop_mode when you switch the power to the battery. If you want to start the laptop_mode mode now, enter sudo laptop_mode start in the terminal to start laptop_mode. After ubuntu is suspended, it will not be able to wake up.