Please try (in this order):

 * Selecting 'Ubuntu on Wayland' from the login screen before you enter
your password (the icon in the bottom right corner). Now does the
flashing also happen on the desktop?

 * The official Ubuntu kernel, which is version 5.4.

 * A slightly older kernel like 5.8.

 * Editing /etc/gdm3/custom.conf and uncomment:
     #WaylandEnable=false
   to:
     WaylandEnable=false


** Tags added: amdgpu hybrid nvidia

** Summary changed:

- Log in screen flashes on and off until I log in
+ [amdgpu] [nvidia] Log in screen flashes on and off until I log in

** Package changed: xorg (Ubuntu) => xserver-xorg-video-amdgpu (Ubuntu)

** Summary changed:

- [amdgpu] [nvidia] Log in screen flashes on and off until I log in
+ [amdgpu] Log in screen flashes on and off until I log in

** Also affects: mutter (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: mutter (Ubuntu)
       Status: New => Incomplete

** Changed in: xserver-xorg-video-amdgpu (Ubuntu)
       Status: New => Incomplete

** No longer affects: xserver-xorg-video-amdgpu (Ubuntu)

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Desktop Bugs, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/1902749

Title:
  [amdgpu] Log in screen flashes on and off until I log in

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