Looking at the H11 motherboard manual, have you tried physically disabling the physical VGA port on the motherboard with a jumper?
I'd be curious to see what disabling JPG1 does (Pins 1-2 VGA Enabled; Pins 2-3 VGA Disabled).
Pretty during disabling that jumper would prevent the use of iKVM. And yes, I have toggled the VGA Priority back and forth. As it stands, with VGA Priority set to onb0ard and my add-on GPU installed, the server will not POST. If the I set the VGA Priority to offboard, the server boots fine but iKVM is unavailable.Not sure if this is the same thing mentioned earlier in this thread, but according to the manual, there is also a "VGA Priority" setting in the bios under the "PCIe/PCI/PnP" configuration options.
"VGA Priority - Use this setting to select between onboard or offboard VGA support. The options are Onboard and Offboard "