Two built-in displays on laptop

Somehow, I've managed to get two built in displays on my laptop. See attached image.
I have no external monitors connected.

My system is a Macbook Pro 5.1 (2008/9 I think)

When it happend I was pressing some form of combo of ctrl-shift-meta-alt plus arrow side keys. Sorry I can't remember exactly.

The situation is still there after a reboot.

I am currently working around it by mirroring the displays.

---
Want to back this issue? **[Post a bounty on it!](https://www.bountysource.com/issues/66176119-two-built-in-displays-on-laptop?utm_campaign=plugin&utm_content=tracker%2F60457221&utm_medium=issues&utm_source=github)** We accept bounties via [Bountysource](https://www.bountysource.com/?utm_campaign=plugin&utm_content=tracker%2F60457221&utm_medium=issues&utm_source=github).