[opensuse-factory] tty input occasionally disappears.

On occasion, pressing Ctrl+Alt+F1 does not reveal the tty input. Instead there is a single non-flashing horizontal cursor on a black screen. This isn't an issue, until debugging is required (for example, when I get strange errors about the lock screen failing, a separate issue). I have never seen this problem before on my other Tumbleweed installation, so I am wondering why it would show itself here on my Asus UX31LA, and how should I investigate it?