I used to run 17.10 and things were working perfectly. when i upgraded the second monitor stopped working. It works just fine in windows but I don't want to use windows. I have a AMD RX 480 as my graphics card.
I upgraded my kernel to the latest stable kernel (4.17.9-041709-generic) and I upgraded the mesa to the newest one. unfortunately neither of those things helped. I also also went into the
/etc/gdm3/custom.conf and changed the set wayland to false and that didn't work either. When I go into recovery mode for this kernel version it works but it doesn't load into gnome. It gets stuck.
Here is my xrandr:
$ xrandr Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384 DisplayPort-0 disconnected (normal left inverted right x axis y axis) DisplayPort-1 disconnected (normal left inverted right x axis y axis) HDMI-A-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 598mm x 336mm 1920x1080 60.00*+ 50.00 59.94 1680x1050 59.88 1280x1024 75.02 60.02 1440x900 59.90 1280x960 60.00 1280x800 60.00 1280x720 60.00 50.00 59.94 1024x768 75.03 70.07 60.00 832x624 74.55 800x600 72.19 75.00 60.32 56.25 720x576 50.00 720x480 60.00 59.94 640x480 75.00 72.81 66.67 60.00 59.94 720x400 70.08 HDMI-A-1 disconnected (normal left inverted right x axis y axis) DVI-D-0 disconnected (normal left inverted right x axis y axis) $ lshw -c video WARNING: you should run this program as super-user. *-display description: VGA compatible controller product: Ellesmere [Radeon RX 470/480/570/570X/580/580X] vendor: Advanced Micro Devices, Inc. [AMD/ATI] physical id: 0 bus info: pci@0000:01:00.0 version: c7 width: 64 bits clock: 33MHz capabilities: vga_controller bus_master cap_list rom configuration: driver=amdgpu latency=0 resources: irq:122 memory:c0000000-cfffffff memory:d0000000-d01fffff ioport:e000(size=256) memory:dfe00000-dfe3ffff memory:c0000-dffff