I quite enjoy pop-os on my Dell m4700 with quadro M2000M so I wanted to see it working on my FrankenStation
The system (and issue) in question:
MB ASUS X570-p, with 3900X and latest (non-beta) bios
32 GiB 3600 cl16 ram
Direct cpu x16 slot: Vega 56 – DP Primary monitor AOC 1440p ultrawide
0x1002:0x687f:1:5:Vega 10 XL/XT [Radeon RX Vega 56/64]
PCI Location (Bus:Dev:Fnc): 15:00:0
chipset x4 slot: R Pro wx4100 – DVI secondary portrait screen
0x1002:0x67e3:1:5:Baffin Polaris11 [Radeon Pro WX 4100]
PCI Location (Bus:Dev:Fnc): 05:00:0
Windows 10 (or 11) works fine after a few hicups; working fine with the AMD downloaded auto-detector which installed the Radeon Pro driver package.
Ubuntu or pop-os (21.04) will install but only provide low res lvmw 1024x768 software render.
It turns out that the built-in amdgpu kernel driver is finding the wx4100 and not looking further perhaps because it has pci-e index 05:00:0 and the Vega is at 0F:00:0 for whatever reason.
So the primary display, a 1440p ultrawide is connected to an unclaimed adapter and so is software rendered.
I’ve found no documentation to force detection of both cards.
In manjaro-GNOME the live iso gets to the graphical-interface checkpoint and then a flickering of large print on the Primary display until I hit reset and give up.
on manjaro-KDE the live iso stalls/hangs at the graphical-interface checkpoint.