Thanks. Perhaps we jumped the gun though...

On your login screen do you see two options "Ubuntu" and "Ubuntu on
Xorg", or only one?

It looks like you might be experiencing a problem with Xorg judging by
comment #4:

Oct 23 08:21:34 hostname /usr/lib/gdm3/gdm-x-session[1533]: (WW) RADEON(0): 
flip queue failed: Invalid argument
Oct 23 08:21:34 hostname /usr/lib/gdm3/gdm-x-session[1533]: (WW) RADEON(0): 
Page flip failed: Invalid argument
Oct 23 08:21:34 hostname /usr/lib/gdm3/gdm-x-session[1533]: (EE) RADEON(0): 
present flip failed
Oct 23 08:21:34 hostname /usr/lib/gdm3/gdm-x-session[1533]: (WW) RADEON(0): 
flip queue failed: Invalid argument
Oct 23 08:21:34 hostname /usr/lib/gdm3/gdm-x-session[1533]: (WW) RADEON(0): 
Page flip failed: Invalid argument
Oct 23 08:21:34 hostname /usr/lib/gdm3/gdm-x-session[1533]: (EE) RADEON(0): 
present flip failed
Oct 23 08:21:34 hostname /usr/lib/gdm3/gdm-x-session[1533]: (WW) RADEON(0): 
flip queue failed: Invalid argument
Oct 23 08:21:34 hostname /usr/lib/gdm3/gdm-x-session[1533]: (WW) RADEON(0): 
Page flip failed: Invalid argument
Oct 23 08:21:34 hostname /usr/lib/gdm3/gdm-x-session[1533]: (EE) RADEON(0): 
present flip failed

** Bug watch added: GNOME Bug Tracker #789540
   https://bugzilla.gnome.org/show_bug.cgi?id=789540

** Also affects: mutter via
   https://bugzilla.gnome.org/show_bug.cgi?id=789540
   Importance: Unknown
       Status: Unknown

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

** Changed in: xorg-server (Ubuntu)
       Status: New => Incomplete

** Changed in: gnome-shell (Ubuntu)
       Status: New => Incomplete

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

-- 
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1725836

Title:
  No more than 2 displays work simultaneously

To manage notifications about this bug go to:
https://bugs.launchpad.net/mutter/+bug/1725836/+subscriptions

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