I run with a laptop (display on, but rarely used) connected to an external monitor. Linux assumes the laptop is the default, and changing the external to primary is next to impossible.
Unity puts everything important on the laptop display in this configuration. That alone is a deal breaker for me.
Note that Ubuntu Classic works perfectly in this setup. My panels go to the external monitor when it's plugged in, and move back to the laptop immediately when it's unplugged.
Unity (as it's currently designed) would pose some serious issues in a dual-display setup even if I could move it to the external monitor. As the launcher is stuck on the left, I'd be constantly overshooting it (laptop display is to the left).
I have it running on dual displays with no problems whatsoever. That said, I have two 22-inch monitors and not a laptop screen. Unity is early days now...I'm sure your issue will be fixed soon enough.
Ubuntu on my dell latitude, running 10.10, doesn't handle unplugging/switching primary monitors. So I am far less confident that the parent post's issue will be fixed anytime soon...
Unity puts everything important on the laptop display in this configuration. That alone is a deal breaker for me.
Note that Ubuntu Classic works perfectly in this setup. My panels go to the external monitor when it's plugged in, and move back to the laptop immediately when it's unplugged.
Unity (as it's currently designed) would pose some serious issues in a dual-display setup even if I could move it to the external monitor. As the launcher is stuck on the left, I'd be constantly overshooting it (laptop display is to the left).