How to wake up the reTerminal LCD after sleep

As of github.com/Seeed-Studio/pi-gen-expand/commit/8affb3b, the fix for this issue has been integrated into the driver, so you don't need to perform additional steps manually

For previous versions, please consider reinstalling the driver from github.com/Seeed-Studio/seeed-linux-dtoverlays. See Install reTerminal drivers after flashing new Raspbian OS for detailed steps.