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It's NVIDIA. Here's the significant part from the NVIDIA control panel:
Driver Handling of Connected Displays on Desktop Computers (Windows Vista only)
When you connect a digital display to your computer while it is on - an action also known as hot-plugging - the driver detects the display and then configures the multi-display mode and display resolution based on the recent record of the displays connected. If no record exists, then the driver applies default settings. A popup message appears at the system notification tray alerting you of the change, giving you the opportunity to change the settings. This also applies if you disconnect, or hot-unplug, a display.
The automatic display configuration also occurs after you turn on your computer and boot into Windows Vista if the driver detects a change in display connections since the last Windows session.
It's Windows 7, but apparently this is the same. It considers disabling one of the cloned displays as "hot-plugging" apparently. Here's the error--the driver detection is wrong, assuming it's 1080p instead of 1080i.
It mentions a record existing...I wonder how I can save such a record.
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