Not in crossfire? Just putting in another pci-e slot? So I could put in my 280x and would work too? Rather not care about power. If i already got it. Prob wouldnt be using much if only 1 monitor plugged into it. I got an older GTX 460 too but would that cause conflictions with AMD + Nvidia?
GTX 460 would conflict nouveau with amdgpu. Just putting the 280X in a secondary slot is all you need.
Cool mate thx. ill do that now I got a spare modular 750w PSU so ill prob have to use that. ill report back when im done.
So i put the 280x in and no joy. Wouldnt even let me in the login, monitors stayed black. It kept flashing each time i tried to log into fedora user login area to desktop and would keep going back to password till i unplugged the heads on the 280X GPU
Wait TAKE THAT BACK GOT IT WORKING! Had to change some plugs out!
Ok so one thing I am noticing however, I assume the drivers for R9 280x are shit or something. Or maybe I need to reseat the GPU cuz its getting artifacting on some logins.
It takes ages to get it to correct but it does. I can put up with that… lol
Basically when I login to Fedora it goes crazy setting up the x6 monitors, the monitor on the 280x just kinda artifacts some times on login so I log back out and back in till it corrects.
Now… Only if i can find that MST hub packages i can refund this thing… I think i threw them away so, w/e I’ll keep the MST Hub till linux gets supported better on them. I’d like to thank you all for the help. Much appreciated been running around for a week trying to get this going.
Now I can get back to work on my Crypto Trading 
Thought id show the finished copy.
So depending on your distro, you will need the latest firmware for the 280X. The 280, 280x, 380, 380x, and 390 cards have some quirkiness depending on the kernel that you are on. With debian this would look like apt install linux-firmware linux-firmware-nonfree
If you are using xorg, you will need to install and configure your monitors with xRandR. If you are using wayland, you need to ensure that you are using the most recent mesa and libdrm for radeon. Going one step further, since you a mixing a device that uses amdgpu and another that defaults to radeon, you may want to get the 280X on the amdpgu driver as well. The radeon and amdgpu drivers both use the radeonsi renderer in the back end. Your artifacting could be a conflict over shared libraries between the two drivers.
They did. It’s actually quite good in my experience, but I’ve been unable to get F27 to launch GDM (or Gnome, for that matter) in Wayland. Does anyone know if they encountered some show-stopping issue and disabled it?
I’ve done this in the past, GTX 660 with R9 380. Worked fine around Linux 4.7.
All you had to do was change a cable? I wonder if I’m encountering the same issue. 
Hmmm, time to visit the all-powerful Amazon wizard for assistance.
I also have a message into AMD support directly to see if they have any insight on if it’s confirmed working on 4.14. (should probably note that MST worked on my nvidia GPU previously, but it died)
I have never has issues with cables from monoprice.com. I have never used DP cables (no DP capable display device). But DVI, HDMI, and audio cables have never been an issue. Especially the Toslink cables.
I like that.
What’s the final config? 5 x monitors from the RX580 and no hub ?
Wonder how many displays my RX480 can drive…
The cable swap was when i was having some issues in fedora 27, it was working then stopped. Then i swapped a cable and it worked.
Yes x5 with 580 8gb, not laggy either like windows with hte mst hub.
@SgtAwesomesauce I’ll have to test out GTX 460 with the 580 if the artifacting pisses me off if you think it works together.
Hmm, I’ll have to give the cable swap a go.
I’d give the GTX 460 a try, Worst case, you’ve just ruled out an option.
Yeah it would be much less power than a 280x too.
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Just a quick update, I took out the 280x just now and it totally got rid of the monitor issue with artifacting/conflicting with the AMDGPU drivers. Its flawless now. Thanks for the tip.
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Glad to hear it. Sorry the AMDGPU drivers weren’t cooperating though. 
I have not failed. I’ve just found 10,000 ways that won’t work.
- Thomas A. Edison
Thanks haha.
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