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mstsc /multimon and 2x 4k displays

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Hi,

I'm trying to understand the limits of the screen resolutions of the mstsc /multimon option of the remote desktop client. I have 2 displays at 3840x2160, Win8.1Pro with a 2012R2 RDSH server. If i understand it, the supported resolutions are 4096 X 2048 per monitor with a maximum of 16 monitors, those were the specs for Win08R2 in 2009 at least.

But i have some results that are a bit puzzling to me;
- if i use 2x 3840x2160 with /multimon, i only get one RDS display
- if i set my main display to 2560x1440 and the second to 3840x2160, /multimon works as expected (showing 2 RDS displays)
- if i set my secondary display to 2560x1440 and the main to 3840x2160, i only get one RDS display.
- if i use /span, i get a session with 7680x2160 (not sure thats relevant, but mentioning it).
- if i use xfreerdp on ubuntu, i get the same results.

So why can't i use 2x 3840x2160 and why does it work when i set my main display to 2560x1440 (with the second being 3840x2160). Can anyone enlighten me?


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