conf file in modprobe.d, my graphical display wouldn't even start up and I was forced to drop back into the terminal and revert everything from there so that it would start again. amdgpu was always used, and when I blacklisted it via a. I was not able to make my system actually use the radeon driver, despite me installing it via the instructions on the Arch Linux Wiki page. Driver Change amdgpu -> radeon: I tried changing from the amdgpu driver to the radeon driver.It didn't break anything after a reboot, and my primary monitor still worked fine, but didn't fix my issue. Updating Drivers: I downloaded the latest amdgpu drivers from AMD's website and installed from there.I've since tried a fresh install of Ubuntu 18.04 and the issue has persisted. Different Distro / Fresh Install: I initially had this issue on Arch, so I changed stuff on there, then did a fresh install to see that the issue still persisted.I only tested this on Arch, but from what I read online this should also apply to Ubuntu. I largely followed the instructions on the Arch wiki for this. Changing nf: I modified my nf to try and explicitly define what the screens would do, but this didn't work.My xrandr output seemed to be fine beforehand, but changing them to the correct values (even though xrandr already indicated that the monitors were at the correct values) did not fix my problem. Changing xrandr Values: I tried changing the values of my monitors via xrandr.The following is a list of everything I've tried that I can remember. Just to preface this all, I've looked at all over the internet and tried most fixes that I've seen on a bunch of Stack Exchange websites and on others. No output shows up with lspci for intel graphics, nor do I believe it should. I have an intel processor as well that could potentially provide graphics, but both monitors are plugged into the graphics card itself and not to the motherboard. As you can see, amdgpu is being used, which I'll go a little more in-depth about later in the post. That line is the only VGA or output-related thing that shows up. Subsystem: Tul Corporation / PowerColor Radeon R9 380X Relevant lspci -nnk output: 01:00.0 VGA compatible controller : Advanced Micro Devices, Inc. xrandr says they are connected, so the xrandr output seems fine and since I can move my mouse and everything over to the second monitor, this seems to all be correct and recognized by Ubuntu and Arch. My two screens are hooked up to DVI-D-0, my main, working monitor that is 1920x1080, and DVI-D-1, my "non-working" monitor, which is 1280x1024. HDMI-A-0 disconnected (normal left inverted right x axis y axis)ĭVI-D-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 477mm x 268mmĭVI-D-1 connected 1280x1024+1920+0 (normal left inverted right x axis y axis) 338mm x 270mm Xrandr output: Screen 0: minimum 320 x 200, current 3200 x 1080, maximum 16384 x 16384ĭisplayPort-0 disconnected (normal left inverted right x axis y axis) The setup works fine in Windows 10, meaning I very much doubt this is a hardware issue. Both monitors are directly connected to the graphics card via two DVI ports. I am running a 1920x1080 monitor (primary, working) and 1280x1024 monitor (secondary, not working). However, it's not actually showing anything on-screen, but rather just a black screen. What's interesting is that the monitor is technically getting a signal, because it doesn't pop up with "Check Signal Cable" (my monitor's "No Signal" warning). It acts like it's functional in pretty much every aspect but doesn't actually display anything. I can move my mouse and software windows over to the other screen as well. Both my primary and secondary monitor show up in the options menu for Displays, and all correct values for resolutions and refresh rates seem to be correct. I have been trying to get my second monitor working on a fresh install of Ubuntu 18.04 LTS, though I've experimented with Arch Linux as well.
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