Ubuntu
mutter package

  1. Bug #1966808
  2. Comment #15

Comment 15 for bug 1966808

Revision history for this message
Joseph Maillardet (jokx) wrote : Re: [amdgpu][radeon] gnome-shell Wayland sessions fail to start (Failed to lock front buffer on /dev/dri/card1: drmModeAddFB2WithModifiers failed: Invalid argument)

MUTTER_DEBUG_USE_KMS_MODIFIERS=0
fixes the issue for me too.
I will give a new try without this variable after update 42.0-1ubuntu1 is released.