(In reply to Rodney A Morris from comment #99)
> Created attachment 145366 [details]
> apitrace of Hearts of Iron IV hard lock
> 
> Apitrace from hard lock playing Hearts of Iron IV without Steam.  The replay
> from this trace will hard lock the computer, though inconsistently.  I've
> replayed the trace three times. The replay hard locked computer one time.

neofetch from hardlock:

          /:-------------:\          
       :-------------------::        -------------------------------- 
     :-----------/shhOHbmp---:\      OS: Fedora release 30 (Thirty) x86_64 
   /-----------omMMMNNNMMD  ---:     Kernel: 5.2.13-200.fc30.x86_64 
  :-----------sMMMMNMNMP.    ---:    Uptime: 25 mins 
 :-----------:MMMdP-------    ---\   Packages: 2202 (rpm), 27 (flatpak) 
,------------:MMMd--------    ---:   Shell: bash 5.0.7 
:------------:MMMd-------    .---:   Resolution: 2560x1440 
:----    oNMMMMMMMMMNho     .----:   DE: GNOME 3.32.2 
:--     .+shhhMMMmhhy++   .------/   WM: GNOME Shell 
:-    -------:MMMd--------------:    WM Theme: Adwaita 
:-   --------/MMMd-------------;     Theme: Adapta-Nokto-Eta [GTK2/3] 
:-    ------/hMMMy------------:      Icons: Adwaita [GTK2/3] 
:-- :dMNdhhdNMMNo------------;       Terminal: tilix 
:---:sdNMMMMNds:------------:        CPU: Intel i7-6850K (12) @ 4.000GHz 
:------:://:-------------::          GPU: AMD ATI Radeon RX Vega 56/64 
:---------------------://            Memory: 2478MiB / 32084MiB 

OpenGL version string: 4.5 (Compatibility Profile) Mesa 19.1.6

Note:  hard lock replayed occurred when the Discord flatpak is also running.