X4 displays detected but only two showing

Hey all,

I'm trying to run a multiple display setup and haven't been able to find any info on my particular problem. I have 4 displays - 2 tvs, a gaming monitor, and the laptop display. I have two of the screens connected via a USB-C (output on lappy) Hub that has 2 HDMI cables on it, and the 3rd display via a HDMI output on my lappy.

So, Windows 11 detects all four screens, but refuses to send a signal to more than two of them. When I connect the third and fourth screens, there's a visual indication that it's been detected, AND it shows in shows the screen in display settings. I have extend desktop selected on all. Anyway, I'm not sure what's keeping it from working. The two displays that aren't working are the ones connected to the HUB btw.

In Nvidia control panel, it only shows the second monitor detected, so that's weird.

Anyone have any idea what's causing this and how to fix it?

Thanks in advance for any help!

Welcome to the forum. Sorry no one has answered you sooner, but I just saw your post today. I would suspect that the issue lies in the USC-C hub. It's possible that even though the additional screens are detected , there is no video output getting to them. I'll bet if you remove the hub and connect one of the devices directly to the usb-c port with a usb-c to hdmi cable that you see video on that device. Hubs of all kinds can be problematic. I would think one transmitting video would be even more so. Is it a powered hub?

Laptops fitted with USB-C multipurpose ports will often have limitations to the functions available on some or all ports - It is usually the Video support that is sacrificed.

This limitation is often related to the cost / designed purpose of the laptop [I am lucky it that My Dell XPS 17 has full feature support on all four Thunderbolt 3 ports, though I did pay handsomely for the "luck"]

The USB-C standard is in a state of flux as technically the USB-C standard only actually applies to the Connector system.- manufacturers can support other lower level transmission standards even down to USB2 or even Power charge only.

These limits are most often applied to hub and other ancillary components so even if the laptop supports the required function all items in the chain must also be fully compliant [probably to the Thunderbolt 3 or soon TB4 standard].

Possible test procedure
Check the specs on the laptop to see that it supports the transmission of Video of the format required by the monitor. and more importantly try each monitor individually in each port on the laptop, then repeat the test with one monitor in each, port with the hub in the chain.

Personally I would expect that the hub could be not compatible with the transmission of video, and assuming that the laptop is fully compatible will need replacing