The OS in my laptop is Archlinux with lightdm on Xorg. After upgrade the system, the i3-wm have problem to start. After start, the screen turn to black and the mouse icon disappeared. And I can't even turn to tty with Ctrl + Alt + Fn, (In fact I think it has worked, because after Ctrl + Alt + Fn and Ctrl + Alt + Delete, my laptop reboot.). I thought it may be some problem with my nvidia driver, because the gnome DE also crashed. But the problem exists after I downgrade nvidia driver to version 435.