Setting up a new Win11 computer system using a Radeon W5700 Pro graphics card and 2 Gefen 4K UHD BaseT Extenders.
The monitor matrix consists of 5 Dell P2423 Monitors, 2 of which are connected DP-HDMI Passive cables and independent HDMI-Extenders with CAT5e connections. We are running the latest 21.Q2 AMD Software Pro and drivers on the W5700. Settings for all 5 monitors are 1920x1200 (60Hz, 8bit).
Initially Windows did not detect the connections via the HDMI extenders unless they were power cycled after startup. Based on this we setup EDID emulation for the 2 extended monitors. Windows now detects the connections at startup, but the monitors do not "sync" unless we either power cycle the extenders or re-apply the EDID settings via the AMD Software Pro Edition software (i.e. we re-apply the EDID Settings previously stored to a file). Once this is done, the remote monitors will "sync" and display the expected output. Once sync'd, the power on the monitors can be cycled with no effect on the Windows display.
The problem is that any time the computer is shut-down or restarted, the monitors will return to their "un-sync'd" operation (i.e. no windows display). We've tried the various EDID settings on the extenders (i.e. pass through, Internal EDID, External EDID, and Hot Plugging Options) with no change in function. Bypassing the Extenders with a direct HDMI connection via a passive DP-HDMI cable resolves the issue but does not provide the required distance requirements for our application. We have alternate plans in the works including different HDMI or DP extenders but wanted to see if we might be missing something simple.
