Comment 29 for bug 640807

We can't set turn_on_external_monitors_at_startup to True again. We already had that, and it causes external monitors to get powered off. This means that you can't use a docked laptop with an external monitor any more, since we don't have any cleverness to detect whether the lid is closed at startup and the internal screen should be powered off (this is because of too many buggy BIOSes, not because we couldn't implement it).

So it seems that both settings cause problems. Can't we just entirely disable this xrandr messing by default? On normal single-screen settings, KMS and X should already care about the resolution, and any mode change that we introduce will not only be prone to misconfigure your screens, but also introduce major startup latencies and thus slow down boot.