I've got 12.10 running here, when I boot the laptop without any external attached, and then plug in my monitor to the HDMI port, the desktop will split between the two monitors. However, if I boot with the external plugged in already, ubuntu doesn't recognize the laptop display at all (and it's blacked out). Going to the displays section of system settings and clicking 'detect displays' doesn't do anything new, and only my Dell 23'' is listed as a connected display. How can I debug / solve?
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