External display resolution changes upon display sleep?
I think it's expected behavior. The problem is that when the monitor sleeps, it is essentially being "unplugged" so the computer thinks it's gone. And when you reawaken it, the computer thinks a new monitor is being plugged in so it defaults to a supported resolution, but it's getting conflicting reports from the monitor and the DVI Link unit. Try to remove the DVI adapter and, instead, try to force your resolution using Display Maestroy (http://www.koingosw.com/products/displaymaestro.php)