Public bug reported:

After performing apt dist-upgrade and rebooting, plymouth doesn't run in
full resolution and the graphical session won't start. The system is
stuck on a blinking cursor. A full log file is attached. Here is the
error:

Mär 03 13:04:13 xxxx /usr/lib/gdm3/gdm-x-session[1753]: (EE) Screen 0 deleted 
because of no matching config section.
Mär 03 13:04:13 xxxx /usr/lib/gdm3/gdm-x-session[1753]: (II) UnloadModule: 
"modesetting"
Mär 03 13:04:13 xxxx /usr/lib/gdm3/gdm-x-session[1753]: (EE) Screen 1 deleted 
because of no matching config section.
Mär 03 13:04:13 xxxx /usr/lib/gdm3/gdm-x-session[1753]: (II) UnloadModule: 
"fbdev"
Mär 03 13:04:13 xxxx /usr/lib/gdm3/gdm-x-session[1753]: (II) UnloadSubModule: 
"fbdevhw"
Mär 03 13:04:13 xxxx /usr/lib/gdm3/gdm-x-session[1753]: (EE) Screen 1 deleted 
because of no matching config section.
Mär 03 13:04:13 xxxx /usr/lib/gdm3/gdm-x-session[1753]: (II) UnloadModule: 
"vesa"
Mär 03 13:04:13 xxxx /usr/lib/gdm3/gdm-x-session[1753]: (EE)
Mär 03 13:04:13 xxxx /usr/lib/gdm3/gdm-x-session[1753]: Fatal server error:
Mär 03 13:04:13 xxxx /usr/lib/gdm3/gdm-x-session[1753]: (EE) Cannot run in 
framebuffer mode. Please specify busIDs        for all framebuffer devices

Interestingly, pressing Ctrl+Alt+F1 when the system is stuck
successfully starts the XServer and brings up the login screen. While I
experience some font rendering issues, most things seem to work fine
after that.

lsb_release -rd 
Description:    Ubuntu Focal Fossa (development branch)
Release:        20.04

uname -a
Linux xxxx 5.4.0-14-generic #17-Ubuntu SMP Thu Feb 6 22:47:59 UTC 2020 x86_64 
x86_64 x86_64 GNU/Linux

The system is a Dell G5 15 5590 laptop using dual intel/nvidia rtx
graphics:

lshw -c video
  *-display                 
       Beschreibung: VGA compatible controller
       Produkt: TU106M [GeForce RTX 2060 Mobile]
       Hersteller: NVIDIA Corporation
       Physische ID: 0
       Bus-Informationen: pci@0000:01:00.0
       Version: a1
       Breite: 64 bits
       Takt: 33MHz
       Fähigkeiten: pm msi pciexpress vga_controller bus_master cap_list rom
       Konfiguration: driver=nvidia latency=0
       Ressourcen: irq:165 memory:ec000000-ecffffff memory:c0000000-cfffffff 
memory:d0000000-d1ffffff ioport:4000(Größe=128) memory:ed000000-ed07ffff
  *-display
       Beschreibung: VGA compatible controller
       Produkt: UHD Graphics 630 (Mobile)
       Hersteller: Intel Corporation
       Physische ID: 2
       Bus-Informationen: pci@0000:00:02.0
       Version: 00
       Breite: 64 bits
       Takt: 33MHz
       Fähigkeiten: pciexpress msi pm vga_controller bus_master cap_list rom
       Konfiguration: driver=i915 latency=0
       Ressourcen: irq:152 memory:eb000000-ebffffff memory:80000000-8fffffff 
ioport:5000(Größe=64) memory:c0000-dffff

** Affects: xorg-server (Ubuntu)
     Importance: Undecided
         Status: New

** Attachment added: "Xorg.0.log.old"
   
https://bugs.launchpad.net/bugs/1865870/+attachment/5333029/+files/Xorg.0.log.old

** Attachment removed: "Xorg.0.log.old"
   
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1865870/+attachment/5333029/+files/Xorg.0.log.old

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1865870

Title:
  xorg via gdm-x-session fails to start with "Cannot run in framebuffer
  mode. Please specify busIDs for all framebuffer devices"

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1865870/+subscriptions

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