Picked up a pair of DisplayPort (male) to HDMI (female) adapters for use up to 8Kx60. Both use the VMM7100 Spyder and are rated at DP 1.4 to HDMI 2.1. The VMM7100 can be firmware upgraded as long as it is fully operational; it must be plugged at both ends, with active video signal on an external display.
The first one seems a bit flaky. Works with R9-380x and 50r6+ monitor, but the resolution transition, from bios to splash screen to OS, causes a momentary ‘no signal’ on the TV. Seems to lock up the motherboard bus every so often, such that power on requires a subsequent reset. In the presence of nearby electrostatic discharge, the signal dropped several times. The machine, adapter, and cords are stationed in a metal shelf. Even so, shield ground should have prevented any such behavior.
The R9-380x is DP 1.2, and 50r6+ should be HDMI 2.0. Not an issue, one would presume, since the adapter has the same or higher spec, and would be able to fallback. Now here is where things get a little weird. I’ve tested both converters, on multiple computers, and one of them only works in the hardware configuration described.
It doesn’t output a video signal if I switch to a different monitor. It doesn’t output a video signal if I switch to a different computer with the 50r6+. The problem literally appears to be a VMM7100 adapter that is locked to a single hardware configuration. I’ve tested it with multiple Nvidia cards, and even a similar AMD (R7-360). To this point, it has been tested with 9 different configurations of base computer, video card, and monitor – and only the one config works.
I’m at a loss; normally if a piece of electronics works in one situation it is almost assured to be 100% good. In this case, one VMM7100 works in a single configuration (with issues), and no others. It is a 99.99% fail.
One too few 