This is how it was with nVidia as well. Also the same in Windows 7, Windows 8, 8.1 and the Windows 10 tech preview. It is just how Vegas seems to be seeing mixed resolution displays at the moment. If there is a way in the program on a setting I have overlooked, then great! If not maybe report this as a bug?

I currently use two 27" Dell Ultrasharp 2K monitors and a 32" 1080p HDTV for preview, which is a mixed setup too and I don't have your problem. Is the 390X the only card in your system?

390x is only card. Also did this when I had a GTX 680 and 580 mix, and also dual 680. Not sure, may be just the monitor mix. 2k is pretty close to 1080.

You don't show what you're 3rd monitor is showing, but the driver is displaying it across all screens & not treating each monitor as individual displays. Eyeinfinity (or whatever) seems to be being used.

Why is your #2 monitor blank when you show it? Does your mouse move over to it normally?

I have an ATI 7850 with three monitors, all mixed res & AR, I can preview on any of them full screen w/o issues.

Check your GPU driver settings. That's where the issue is (and I wouldn't call it an issue, I'd say something is enabled you don't want).

@TheHappyFriar: His #2 is only blank before he turns on the dual display.

@doublehamm

Maybe it's a monitor setting or cable issue. How is the monitor connected to the graphic card? It should be via Display Port with DP 1.2 cable to get 4K @60Hz; I am not sure the if the R9 390 does already have DP 1.2.

I notice when you click "Identify Displays" that Vegas puts the display number on the left side of your 287 display. It should land in the center. And then when you try to play the video it spans two displays.

1920x2=3840, so for some reason your graphics card is just spreading the image across two 1920 displays.

I'm guessing you've got your display driver set up to do something clever to make 4K on a 28" screen usable. If it were displaying at actual pixels the text of applications would be too small to read on a screen that size. So I think there's a conflict with a scaling setting somewhere.

You might find that the graphics card setting that makes the display work as a 4K monitor for Vegas makes it hard to use for anything else.

Rob

Do us a favor, take a screen grab via print screen & post that for us. It should make an image with all your screens combined in to one image, all at the res they're set it.

Monitor has DP 1.3 cable.

Not sure what graphics settings - I have tried a mix of nVidia and ATI cards with same result. As well as on Win 7, 8, 8.1 and win 10 preview.

First pic is of the full shot (scaled down for size)
Second pic is what it looks like spread across monitors. It appears to crop the first screen to 1/4, then the 2nd screen to 1/8. (scaled down for share size)

What are the dimensions of the second pic before you scale it down? If your screen layout were side by side by side then I guess you'd get a (3840 + 1920 + 1920 = 7680) x (1080 + 1080 = 2160) screen capture, with two 1920 x 1080 black areas under the screens of that size. That's not what your screen grab shows, though. (Or maybe it is since part of your preview output is playing on one of the 1920x1080 screens).

So, you could compare this with a screen grab when Vegas is not doing external preview to see how the display and layout changes. You could also start taking monitors away to simplify the problem. To me it still seems like Vegas sees your 4K screen as part of the adjacent 1920 screen. I assume Vegas is doing that because that's what the GFX card or driver is telling it.

Rob

Time passes...
So I took the dimensions of your second screen grab and scaled them. It looks like the original was 7680 x 2160. Given that, Vegas is scaling your preview across a width of the 4K monitor + the adjacent 1920 screen. the bottom third of the image is just being sent off into limbo, and in fact it's the bottom 2/3rds where the image is on that 1920 screen.

Two things I'd look at. One is that your GFX card may be combining those two screens into one, perhaps indicating that your card or driver can only handle 2 discrete screens and is just creating a super big display space for those two screens to share. If that's the case then what you really want is for it to treat the 4K screen as a discrete screen and the two 1920 screens as ganged screens. That might just be a matter of connecting the 4K screen to the first output on the card, if there is such a thing.

Second, since your output is spanning what amounts to a screen and a half, that makes me thing that output to the 4K screen is being enlarged by 150%. That seems pretty likely to make it usable when not a preview screen. Stop doing that.

Those are my guesses.

Rob

I see where it is scaling everything and I have bounced back to my GTX 580 and GTX 680 cards this morning as well (This is a R9 390x). Everything still happens this way. Even if I put the 4k monitor on the first card and other monitors on 2nd card.

If I do 2560x1440 everything works well. All other resolutions down to 1080 and up to 2160 are all funky when I go to full screen preview. .

I have tried multiple GPU setups (2xGTX 680 as well as GTX 680 + GTX 580), as well as this single GPU setup with same results. This single card doesn't have option on how the display port works as a main monitor.

Stop doing what?

What's the arrangement of your screens in your AMD Catalyst- Desktop Management - Creating & Arranging Desktops.

A screen would be helpful.

Up until now I used Windows desktop management for arranging and resolution.

I just went through Catalyst, and here is what I ended up with - even more zooming and cropping:

Pic 1 is the configuration
Pic 2 is a new SS with the Vegas Pro window open for external monitor. .





These are full rez with no re-scaling.

If I successfully link to the image, here’s what I’ve got:

http://www.dropbox.com/s/2nwge4wps6ouvyx/Image1.jpg?dl=0

The bottom two monitors are Dell 24” 1920x1080 and the top one is Samsung 28” 3840x2160

This is Vegas Pro 13

Graphics card is Nvidia GTX 670, and the 4k screen is connected to HDMI

Top Monitor is No.1, Bottom left No.2 Bottom Right No.3

Bottom Left No.2 is set as Main Monitor

(Edit: the linked display didn't work, but clicking the link will reveal)

peter, i think if you remove the 's' in the https it'll work?

Thanks for the idea Leslie, but removing the " s " made the htttp// disappear, but no pic.

I want to see the screengrab of the Catalyst setup. That displays the setup in the monitor ratio they are setup to display. IE if you have a 1920x1080 16:9 and 640x480 5:3 setup then it will show, in proper ratios, how that is setup for your system.

You don't say what monitor is connected to which display adapter, but remember that the maximum resolution in most display adapters is shared with the output ports. In my case, I can drive two 2K monitors or one 4K monitor. Have you tried dedicating one display adapter to the 4K display alone?

Also note the specs for the 680 say: "3840x2160 at 30Hz or 4096x2160 at 24Hz supported over HDMI. 4096x2160 (including 3840x2160) at 60Hz supported over Displayport."

"Stop doing what"

What I have in mind is the Windows Control panel that changes text size. On Win7 the path is "Control Panel\Appearance and Personalization\Display" and the largest setting is 150%. You probably want to zero that out for the moment.

This setting might not be specifically what's wrong, but a 28" screen at 4k should be showing tiny little screen fonts and widgets. My guess is that anyone would try to change that to make the 4k screen usable. There might even be something built into the 4k monitor to make it act like a "Retina Display". For example, my Samsung tablet has an 800x1200 screen but an "X Factor for DIP" of 1.33~. This controls how apps fit themselves to the screen.

Looking at your screen shot, it seems weird to me that all three screens have a taskbar, and that the taskbars repeat. Should it be that way?

Rob

With multimonitor setups you have the option of all having a single taskbar shared between them all, only taskbar on one screen, or each having it's own taskbar. Right click on the taskbar & click properties, then there should be an option for multidisplay.

The multiple taskbar thing in Win 8 and 8.1 and is normal. Win 7 didn't do that, at least without looking at settings. I much prefer it this way, makes it easy to see which apps are running when you have other apps at full screen on other monitors.

Nothing is enlarged 150%. If you look at the screenshot you can see the taskbar on the first monitor is much less "full" compared to the others. It has very tiny icons, but may be hard to tell from that screenshot unless you blow it up to full scale.

I have tried separating the monitors to different adapters.

Peter, I am wondering if using HDMI instead of DP might help, I will try that. However, HDMI is stuck at 30Hz when at 4k. THat would be okay for editing video as nothing I have seen yet records 4k video faster than 30p.