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I've been on here over the last couple years trying to get my six monitors to work with my two R9 290X graphics cards while retaining "good" performance. I was able to get it to work before but there was tearing effects and it was laggy to the point where it was unbearable when transitioning between monitors. I just wanted to say the AMDGPU drivers and perhaps any new updates in Xorg or anything since then must have done the trick. Also I needed the AMDGPU driver to be enabled during initramfs by editting /etc/mkinitcpio.conf... but all of this is right in the archwiki. AMDGPU must be new? I don't recall ever seeing it since before this installation anywhere...
Here is what I think all the relevant installtion is (Note: Not using any xorg.conf file):
X -version
X.Org X Server 1.19.3
Release Date: 2017-03-15
X Protocol Version 11, Revision 0
Build Operating System: Linux 4.9.11-1-ARCH x86_64
lshw -C video
*-display
description: VGA compatible controller
product: Hawaii PRO [Radeon R9 290/390]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:01:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: vga_controller bus_master cap_list rom
configuration: driver=amdgpu latency=0
resources: irq:26 memory:e0000000-efffffff memory:f0000000-f07fffff ioport:e000(size=256) memory:f7e00000-f7e3ffff memory:c0000-dffff
*-display
description: VGA compatible controller
product: Hawaii PRO [Radeon R9 290/390]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:02:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: vga_controller bus_master cap_list rom
configuration: driver=amdgpu latency=0
resources: irq:27 memory:c0000000-cfffffff memory:d0000000-d07fffff ioport:d000(size=256) memory:f7d00000-f7d3ffff memory:f7d40000-f7d5ffff
xrandr --listproviders
Providers: number : 2
Provider 0: id: 0x91 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 6 outputs: 4 associated providers: 1 name:AMD Radeon R9 200 Series @ pci:0000:01:00.0
Provider 1: id: 0x49 cap: 0xf, Source Output, Sink Output, Source Offload, Sink Offload crtcs: 6 outputs: 4 associated providers: 1 name:AMD Radeon R9 200 Series @ pci:0000:02:00.0
lspci | grep VGA
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Hawaii PRO [Radeon R9 290/390]
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Hawaii PRO [Radeon R9 290/390]
xrandr --version
xrandr program version 1.5.0
Server reports RandR version 1.5
Last edited by AstralAbraxas (2017-05-17 01:58:26)
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