Windows 7: Primary display fails to wake up after RDC session with

If I RDC to my desktop and then disconnect, and allow Windows to put the monitors back into sleep mode, then when I try to wake up the computer later, only the secondary screen turns back on (primary does not wake up). Cycling the power on the screen does not do anything. I've found that unplugging the dvi cable for the main monitor from the card and plugging it back in will force it to wake up, as if nothing had happened. To clarify, I do not have my PC configured to hibernate or go to sleep automatically; only the monitors are configured for automatic sleeping.