Going back to your JournalErrors.txt: 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
I would like to verify if those errors correlate with the problem. Can you please run: journalctl -f and see if those errors only occur when trying to drive 3 monitors? Do the errors go away when only 2 monitors are plugged in? ** Also affects: xserver-xorg-video-ati (Ubuntu) Importance: Undecided Status: New -- 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/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 _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp