I purchased an Sapphire Radeon RX 460 card for my Loki machine, installed it and booted. I can log in fine but my machine does not detect my dual displays, one currently mirrors the other one.
I tried to install the AMDGPU-PRO drivers, got the unsupported OS error, changed all of my system information to look like a vanilla Ubuntu machine, the successfully installed the drivers.
After rebooting I get dual blackscreens except for my mouse pointer. Then I uninstalled the AMDGPU-PRO drivers and I'm back to my 1 monitor problem. I've tried installing the oibaf drivers but that didn't fix the issue.
When I check software-properties-gtk I get "no proprietary drivers in use".
lspci shows the following entry:
02:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Device 67ef (rev cf)
Update 1: I've since put my nvidia card back in but I'd like to get the AMD card working if possible since it's such a newer card.
I did notice in the "additional drivers" section no drivers show up except for "intel microcode" whereas when I have the nvidia card in it shows the nouveau driver and possible Nvidia branded drivers themselves. Is this normal for AMD cards?
Update 2: Is no one using an AMD video card on Loki or Ubuntu 16.04?
Update 3: Below is xrandr --verbose output if that gives more helpful information:
xrandr: Failed to get size of gamma for output default Screen 0: minimum 1920 x 1080, current 1920 x 1080, maximum 1920 x 1080 default connected primary 1920x1080+0+0 (0x274) normal (normal) 0mm x 0mm Identifier: 0x273 Timestamp: 73741 Subpixel: unknown Clones: CRTC: 0 CRTCs: 0 Transform: 1.000000 0.000000 0.000000 0.000000 1.000000 0.000000 0.000000 0.000000 1.000000 filter: _MUTTER_PRESENTATION_OUTPUT: 0 1920x1080 (0x274) 159.667MHz *current h: width 1920 start 0 end 0 total 1920 skew 0 clock 83.16KHz v: height 1080 start 0 end 0 total 1080 clock 77.00Hz