I am attempting to create a 2 x 2 video wall using 4 viewsonic cdx4952 4k displays with an AMD Radeon Pro WX4100 display adapter. The ViewSonic displays allow for a daisy chain setup, so i have a single display connected to my adapter via a 4K capable mini-displayport to displayport cable, and then from that display's displayport out i connect another display and then from that monitors displayport out i connect another and so on. The adapter does see multiple displays, but, doesn't see 4, it only sees 2. Anyone else run into this issue before?
What Multi-Monitor software are you using?
If you are using AMD Eyefinity here is how to setup you wall display and resolutions: Setting Up and Configuring Multiple Displays to Run in AMD Eyefinity Mode .
This website explains how to properly daisychain three monitors and maximum resolutions for DP 1.2 MST.: [DisplayPort Quick Guide] Daisy Chaining 2 to 4 Monitors - The World's Best PC Builder
Copied from DisplayPort Quick Guide:
According to the graph only One monitor will support 4k with a DP 1.2 MST. but with 1920 x 1080 you can have up to 4 monitors connected.
Possibly if you have DP 1.4 you can have more monitors with higher resolutions. Here is the capabilities of DP 1.4 Bandwidth and resolutions: https://linustechtips.com/main/topic/761112-displayport-14-hubs/
It's free to VESA members, which is every company who wants to implement it, but not to the general public.
DisplayPort 1.4 has 50% more bandwidth than DP 1.2.
The max on a single port is:
1× 2560×1440 at 240 Hz
1× 3840×2160 at 120 Hz
2× 2560×1440 at 120 Hz
2× 3840×2160 at 60 Hz
3× 1920×1080 at 144 Hz
3× 2560×1440 at 90 Hz
4× 1920×1080 at 120 Hz
4× 2560×1440 at 60 Hz
Assuming 24 bit/px RGB color, no compression, etc.
Note: Your GPU, MST and all Monitors must be able to support DP 1.4 .
According to your Viewsonic Manual, you can configure the DP on the Monitor from DP 1.1 or DP 1.2: http://www.viewsonicglobal.com/public/products_download/user_guide/CD/CDX4952/CDX4952_UG_ENG.pdf?pass
This is from the Viewsonic Manual from above link:
Seems like the DP ports on the Viewsonic are DP 1.2 so there isn't enough bandwidth to Daisychain 4 monitors at 4k only One Monitor at 4K.
I might be wrong, maybe some other User can verify or dispute my findings.