Public bug reported:

If I have a thunderbolt monitor, it works fine-ish, most of the time,
and I can connect, disconnect, etc.

If EVER I connect to an HDMI monitor, it connects and will disconnect,
but then displayport NEVER WORKS AGAIN until I reboot the laptop.

After using and disconnecting HDMI:

shevek@starling:~$ xrandr -q
Screen 0: minimum 8 x 8, current 3840 x 2160, maximum 32767 x 32767
DP-0 connected (normal left inverted right x axis y axis)
   2560x2880     60.00 +
DP-1 connected (normal left inverted right x axis y axis)
   4096x2304     60.00 +
   3840x2160     60.00  
   3200x1800     60.00  
   2560x2880     60.00  
   2560x1440     60.00  
   640x480       59.94  
HDMI-0 disconnected (normal left inverted right x axis y axis)
eDP-1-1 connected 3840x2160+0+0 (normal left inverted right x axis y axis) 
344mm x 193mm
   3840x2160     60.00*+  59.98    59.97  
   3200x1800     59.96    59.94  
   2880x1620     59.96    59.97  
   2560x1600     59.99    59.97  
   2560x1440     59.99    59.99    59.96    59.95  
(etc)

BUT:
+ xrandr --output DP-1 --mode 3840x2160 --above eDP-1-1
xrandr: Configure crtc 0 failed
X Error of failed request:  BadValue (integer parameter out of range for 
operation)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  21 (RRSetCrtcConfig)
  Value in failed request:  0x0
  Serial number of failed request:  55
  Current serial number in output stream:  55


and then the screen goes blank. And now I have to reboot again, which is kind 
of meh because of #1852797 the laptop crashes every day or two anyway on 19.10 
where it didn't crash on 19.04 but ... still a pain.

This bug existed on 19.04 with nvidia-driver-418 and exists in nvidia-
driver-430.

ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: xserver-xorg-video-nvidia-430 430.50-0ubuntu2
ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
Uname: Linux 5.3.0-23-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
CurrentDesktop: XFCE
Date: Wed Nov 20 15:16:06 2019
InstallationDate: Installed on 2019-01-21 (303 days ago)
InstallationMedia: Xubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 
(20181017.2)
SourcePackage: nvidia-graphics-drivers-430
UpgradeStatus: Upgraded to eoan on 2019-11-10 (10 days ago)

** Affects: nvidia-graphics-drivers-430 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug eoan

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https://bugs.launchpad.net/bugs/1853381

Title:
  Using HDMI output breaks displayport permanently

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