When Ubuntu logs in automatically, I get this weird artifact issue on the main screen. It has an AMD A9 APU.
The image shows that the top bar is okay but the rest of the screen is not.
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This is a bug as described in Xubuntu 20.04 AMD-users: Garbled display fix : xubuntu. You need to run below command in either a terminal or TTY
xfconf-query -c xfwm4 -p /general/vblank_mode -t string -s "glx" --create
Restart the computer after running the command.