I recently bought x6 ASUS 24inch monitors for my battle station and I’m having a tad bit of an issue setting up the MST Hub to get the extra 3 working.
I’m entirely new to xorg configurations, and i have a unique case here, any help would be much appreciated. In ubuntu 16.04 with AMD GPU Pro drivers running on a RX 580 8GB. 1 HDMI + 2 DP (3 monitors without hub) works fine. Plug in the Hub into the 3rd DP nothing in the MST Hub. it still runs fine.
Plug a HDMI to DP cable from the monitor to the hub for the remaining 3 monitors. As soon as i plug the first monitor in it detects it, but only allows 1024×768, also unknown is named on it and does not display anyout put on the monitor. Also it lags / locks up for a good minute.Plug in another monitor and it just craps out to black screen. Did a variation of boots with all of them plugged into the MST HUB, and so on. No joy.
Update: using fedora 27 hub is recognized and now mirroring but not extending so at least getting further.
[SOLVED] - Replaced OS with Fedora 27, since it has multi GPU Support Using the old AMD GPU i previously had with the new one for the last 6th Montior (5 on Rx 580 1 on R9 280X) for my x6 Monitor setup.
Problems: R9 280X - x1 monitor some times artifacts and requires countless relog’s to correct the display.
Update: Still having issues. Has anyone ever had these problems? @wendell Probably the only person I know with lots of monitors setup, hopefully one day he has some spare time to check this lol.
MST Hub, Dmesg states [drm:amdgpu_dm_connector_mode_valid [amdgpu]] ERROR dc_sink is NULL! and the monitor isn’t detected on the hub so all the settings revert to like unknown.
GPU Plugged in with: x2 end DP slots and a HDMI for x3 Monitors WITHOUT Hub.
Hub is plugged into the first DP Slot, with 1 Monitor being detected but sink name isn’t.
It’s a real shame Xorg is so broken for multi monitor that it does not allow multiple displays over multiple GPUs. Hoping Wayland fixes this. Have you tried GNOME with native Wayland? Fedora defaults to Wayland GNOME.
Yeah, Cinnamon is still pretty tied to Xorg. KDE and GNOME are slowly moving towards Wayland, but only GNOME defaults to Wayland on some default flavors of some distros.
Well, its fully installed on Fedora 27, Good news so far is it detected the Monitor plugged into the MST, But only one and it mirrored the displays.
So I need to find some opensource AMD GPU Drivers for RX 580 that supports the MST Hub. I dont game on this box so as long as I can get the multi monitors working thats all that matters.
Aha, so Wayland did make a difference! Hopefully the Radeon open source drivers will support that cause I know there’s a big community of people writing code for that. Maybe request it as a feature?
Not sure if that would work if it works fine on windows 10 with all 6 monitors. But I guess wouldnt hurt to try, I’ve put as many monitors on the GPU i can get the MST hub down to only 2. With DVI on GPU.
Yeah, that’s what my MST hub does too. Also on fedora 27.
I previously had ubuntu, which didn’t recognize the hub at all or any monitors connected to it. At least with fedora it recognizes the other monitors and displays. Just wish it extended not mirrored.
Do you think I assume you mean in crossfire? I only have a 280x spare atm I guess I could pickup a 560, but then again I bought this MST HUB to do what the extra card would do… but prob be my last resort.
Tho, on second hand another gpu could help with lag with so many monitors. Anyone know the ram usage per monitor on average?
The 560 would be more energy efficient, but I’m not talking about Crossfire, I’m only talking about having a second low power GPU with enough ports to satisfy the rest of your monitors, and it looks like with Wayland, they finally fixed multiple displays over multiple GPUs, something impossible with Xorg.
