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
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https://bugs.launchpad.net/bugs/1725836
Title:
No more than 2 displays work simultaneously
Status in Mutter:
Incomplete
Status in gnome-shell package in Ubuntu:
Incomplete
Status in mutter package in Ubuntu:
Incomplete
Status in xorg-server package in Ubuntu:
Incomplete
Status in xserver-xorg-video-ati 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
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