apport information ** Tags added: apport-collected zesty
** Description changed: Upgrading from UbuntuStudio 15.10 to 16.04, my 2nd display is a no more a 1st display extension and only a clone. xrand detects only one display. $ xrandr xrandr: Failed to get size of gamma for output default Screen 0: minimum 1400 x 1050, current 1400 x 1050, maximum 1400 x 1050 default connected 1400x1050+0+0 0mm x 0mm 1400x1050 77.00* $ lspci -nn | grep VGA 00:01.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Sumo [Radeon HD 6410D] [1002:9644] $ dmesg | egrep 'drm|radeon' [ 1.293303] [drm] Initialized drm 1.1.0 20060810 [ 1.328085] [drm] VGACON disable radeon kernel modesetting. [ 1.328109] [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module! [ 12.801460] [drm] VGACON disable radeon kernel modesetting. [ 12.801484] [drm:radeon_init [radeon]] *ERROR* No UMS support in radeon module! $ uname -r 4.4.0-21-lowlatency $ Seems same than bug 1407505, but apport-bug failed, so I created a new bug. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: xorg 1:7.7+13ubuntu3 ProcVersionSignature: Ubuntu 4.4.0-21.37-lowlatency 4.4.6 Uname: Linux 4.4.0-21-lowlatency x86_64 ApportVersion: 2.20.1-0ubuntu2 Architecture: amd64 CurrentDesktop: XFCE Date: Fri Apr 29 23:19:49 2016 EcryptfsInUse: Yes InstallationDate: Installed on 2015-08-21 (252 days ago) InstallationMedia: Ubuntu-Studio 15.04 "Vivid Vervet" - Release amd64 (20150422) SourcePackage: xorg Symptom: display UpgradeStatus: Upgraded to xenial on 2016-04-24 (5 days ago) + --- + ApportVersion: 2.20.4-0ubuntu4 + Architecture: amd64 + CasperVersion: 1.380 + CurrentDesktop: XFCE + DistroRelease: Ubuntu 17.04 + LiveMediaBuild: Ubuntu-Studio 17.04 "Zesty Zapus" - Release amd64 (20170412) + Package: xorg 1:7.7+16ubuntu3 + PackageArchitecture: amd64 + ProcEnviron: + TERM=xterm-256color + PATH=(custom, no user) + XDG_RUNTIME_DIR=<set> + LANG=fr_FR.UTF-8 + SHELL=/bin/bash + ProcVersionSignature: Ubuntu 4.10.0-19.21-lowlatency 4.10.8 + Tags: zesty + Uname: Linux 4.10.0-19-lowlatency x86_64 + UpgradeStatus: No upgrade log present (probably fresh install) + UserGroups: adm audio cdrom dip lpadmin plugdev sambashare sudo + _MarkForUpload: True ** Attachment added: "Dependencies.txt" https://bugs.launchpad.net/bugs/1576864/+attachment/4870017/+files/Dependencies.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1576864 Title: Unable to extend to second display To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1576864/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs