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Direct71 days ago

I see. Thank you for doing that investigation work. Roughly a year ago another user has essentially the same issue also when using two identical monitors. We found a way to disambiguate using the location reported by Windows in the registry in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\DISPLAY\[YOUR DISPLAY ID]. I ended up taking the location reported, hashing it (converting it to that number you see), then using that to find the display when opening MiniMeters. It seems in your case it's reporting the same ID, which was presumed to not happen.

Would you be able to check that section of your registry to see if the path inside your display's ID is unique to each? Additionally, could you please check to see if the EDID in "Device Parameters" is also unique to each individual display?

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KamilKiri71 days ago (3 edits)

Thanks for the reply, I checked my registry and extracted the data

I attached my DISPLAY.reg here:
https://pastebin.com/e6hwf7K6

My displays share a very similar base instance path, differing only by the UID at the very end. 

Main Monitor (PL3466WQ): IVM761A\5&2cd6120d&1&UID37121

Side Monitor (ANMITE): RTK1920\5&2cd6120d&1&UID37124

TV (Beyond TV): TCL9653\5&2cd6120d&1&UID37120 (this one is disabled for now)

There are other unique identifiers inside these registry keys that you might be able to use to disambiguate:

Address: They have unique hex addresses (00000111, 00000114, and 00000110 respectively).

ContainerID: Each display has a completely unique GUID assigned to it.

2. EDID Uniqueness

Yes, the EDID hex blocks inside the Device Parameters are 100% unique for each individual display. They do not overlap at all:

IVM761A EDID starts with: 00,ff,ff,ff,ff,ff,ff,00,26,cd,1a,76...

RTK1920 EDID starts with: 00,ff,ff,ff,ff,ff,ff,00,4a,8b,20,19...

TCL9653 EDID starts with: 00,ff,ff,ff,ff,ff,ff,00,50,6c,53,96...

Hopefully, this helps you adjust the display identification logic! Let me know if you need me to test a beta build.

PS. I noticed one more detail. My main monitor (IVM761A) actually has two different subkeys in the registry: 1&8713bca&0&UID0 and 5&2cd6120d&1&UID37121. One of them is an active profile, and the other is an inactive "ghost" entry (likely created when I changed a cable or GPU port in the past).

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