Custom Resolution Utility (CRU)

[Mairsile]

(09-28-2022 08:13 PM)ToastyX Wrote:  

(09-28-2022 07:53 PM)Mairsile Wrote:  I'm having an odd issue I'm hoping for some assistance with.

When I only run 2 of my 3 monitors, I have all of the appropriate resolution options.
But as soon as I turn on a 3rd, I loose the resolution options I want for the 1st and 2nd, and Windows cannot identify them no matter what I do.

Here is what's happening told with images. https://imgur.com/a/QHSirGb

First, I mark monitor 2 as disconnected in the settings - Image 1
Then, because monitor 2 is disconnected, both monitors #1 and #3 display their proper resolution settings as options. Monitor 1 displays 2560 x 1080 and Monitor 2 displays 1080 x 1920 (it's in portrait). - Images 2 and 3
Next, I turn on monitor 2 - Image 4
Now, because of that, Monitor 1 doesn't show anything above 1920 x 1080, which is not correct aspect ratio as it is a 21:0. And monitor 3 doesn't have any 16:9 options. Image 5 and 6

Any ideas out there as to why this happening?

That's a GPU-dependent problem. Either the GPU has a bandwidth limit, or it doesn't support the combination of connectors you're using.

You appear to be correct.
The setup in those photos was PC->USB-C to a docking station->All monitors off the docking station.
I instead took the third monitor, and plugged it directly into the HDMI port of the PC, leaving the other two in the dock, and it works.

So that would lead me to believe it's not GPU limit, but a USB-C limit?