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 Desktop Packages, which is subscribed to gnome-shell in Ubuntu. https://bugs.launchpad.net/bugs/1725836 Title: No more than 2 displays work simultaneously Status in Mutter: Unknown Status in gnome-shell package in Ubuntu: Incomplete Status in mutter package in Ubuntu: Incomplete Status in xorg-server package in Ubuntu: Incomplete Bug description: I have three displays that worked fine in 17.04. Now ith 17.10 I can only use two of them. Either 1 & 2, 1& 3 or 2 2 & 3. All three seem to be properly specified in monitors.xml. The display setup scree detects all three. UBUNTU 17.10 AMD PitcairnLSB Version: core-9.20160110ubuntu5-amd64:core-9.20160110ubuntu5-noarch:security-9.20160110ubuntu5-amd64:security-9.20160110ubuntu5-noarch --- ApportVersion: 2.20.7-0ubuntu3 Architecture: amd64 CurrentDesktop: ubuntu:GNOME DisplayManager: gdm3 DistroRelease: Ubuntu 17.10 InstallationDate: Installed on 2017-02-23 (242 days ago) InstallationMedia: Ubuntu 16.10 "Yakkety Yak" - Release amd64 (20161012.2) Package: mutter PackageArchitecture: amd64 ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4 Tags: artful Uname: Linux 4.13.0-16-generic x86_64 UpgradeStatus: Upgraded to artful on 2017-10-20 (3 days ago) UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo _MarkForUpload: True To manage notifications about this bug go to: https://bugs.launchpad.net/mutter/+bug/1725836/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
