I have a monitor with a native resolution of 2560x1440, connected through display port.
I also have an AV Receiver connected to the video card via HDMI, to have surround sound in games. All using Radeon HD 5670 (will upgrade soon to HD 7850).

The problem is that my computer detects the receiver as a separate monitor, with the highest available resolution of 1920x1080. I have 3 options:

• Disconnect the second display. But then the sound (digital audio output through video card) also disappears.
• Duplicate displays. But then my primary monitor resolution is reduced to a maximum of just 1920x1080, that being the maximum of the second monitor.
• Extend desktop. This is the solution I picked so far, it being the least evil. The problems I face in this situations are 2: I have a blank part of the desktop where I sometimes lose my mouse pointer, so I made the extension small, 640x480, and placed it in a corner; when I turn off the main display, all windows resize to 640x480.

In Kubuntu I had the option to duplicate the displays, while keeping the higher resolution. Which was great. I tried overriding using the Win7 netbook hack, but it's not available on non-netbooks.
Is there a similar solution for this problem in Windows 7?