Ubuntu 19.10 Razer Core X Saphire RX 580 - hot-plug freeze; kernel oops on boot

[James Rhew]

Hardware (verified working with Windows 10)
- Lenovo X1 Carbon Gen 7
- Razer Core X with Saphire RX 580
  - lspci-vvnn.log

Software
- New install of Ubuntu 19.10
  - uname-a.log
  - version.log
- mesa and amdgpu software from eoan repo

Symptoms when hot connected
- Doesn't work
- Eventially freezes (mouse and clock frozen)
  - dmesg.0.before-hot-plug.txt
  - dmesg.1.not-yet-frozen-after-hot-plug.txt
  - dmesg.2.frozen-after-hot-plug.txt
  - Xorg.0.log
  - regdump_good.txt
  - regdump_broke.txt
- on `sudo reboot`, GPu attached displays show shutdown banner (this is the only time they display anything)

Symptoms when connected at startup
- Crash
- dmesg.3.kernel-oops-reboot-while-attached.jpg
- Reported bug through GUI after reboot, I think this identifies it:
```
rhew@x1:/var/crash$ sudo cat _usr_bin_gnome-shell.124.uploaded
6be3909c-2f27-11ea-a76d-fa163ee63de6

[James Rhew (jsrhew)]

dmesg.0.before-hot-plug.txt
dmesg.1.not-yet-frozen-after-hot-plug.txt
dmesg.2.frozen-after-hot-plug.txt
dmesg.3.kernel-oops-reboot-while-attached.jpg
lspci-vvnn.log
regdump_broke.txt
regdump_good.txt
uname-a.log
version.log
Xorg.0.log

[James Rhew (jsrhew)]

Appears to work with updated Ubuntu 18.04. I'll keep the 19.10 partition around for a little while in case I can provide further information.