Here's a useful quote from the Secrets link Kevin posted on the previous page:
If however, you have an HDMI source and a DVI display, the below-black video information may be lost in the translation. There is a bug in the Silicon Image HDMI transmitter that pops up when converting YCbCr to RGB.
Does this affect using a DVI switcher between HDMI source and HDMI display? Since the DVI switch is a pure switching mechanism, with no processing applied, my understanding of it suggests that there is no issue - the DVI switching is simply shuffling the pin pattern of the wires carrying the signal at the switch. So the issue is really not related to the 990 at all, but to the source and display components that
might be used - in which case, the problem would exist (or not exist, depending on the combination of source and display components) even if the 990 weren't used.
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