It does that even with network access (I didn't see any additional traffic when it happens in a packet capture). I have to use a programmable HDMI splitter that

It does that even with network access (I didn't see any additional traffic when it happens in a packet capture). I have to use a programmable HDMI splitter that presents an EDID when the real input is off just to get rid of that behavior. My computer resuming from sleep triggers it.