Public bug reported: Steps to reproduce:
1. Log in to the desktop. 2. Log out again. (But don't reboot or anything like that.) 3. Log in again. 4. Start a guest session. Result: Depends on Xorg server in use. With intel driver, the guest Xorg session fails to start up with a DRM permission error (see attached Xorg.1.log). With virtualbox, and possibly AMD proprietary driver, the Xorg session on :1 appears to fight the one on :0 for control of the framebuffer - windows from both desktops get drawn over each other, causing a big mess. The login/logout step is important: if you log in to the desktop immediately after the lightdm session has been started or restarted ("sudo service lightdm restart"), then the :1 session will start correctly. (This problem can also be reproduced in another way: some desktops, when locking the display, create a new greeter instance on :1. This will also fail if the user has logged out and logged in again. For example, Xubuntu does this.) ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: lightdm 1.9.3-0ubuntu1 ProcVersionSignature: Ubuntu 3.12.0-4.12-generic 3.12.1 Uname: Linux 3.12.0-4-generic x86_64 ApportVersion: 2.12.7-0ubuntu1 Architecture: amd64 CurrentDesktop: Unity Date: Fri Nov 29 01:41:28 2013 InstallationDate: Installed on 2013-11-29 (0 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20131128) SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: lightdm (Ubuntu) Importance: High Status: Confirmed ** Affects: xorg (Ubuntu) Importance: High Status: Confirmed ** Tags: amd64 apport-bug trusty ** Description changed: - bug description to be completed.... + Steps to reproduce: + + 1. Log in to the desktop. + 2. Log out again. (But don't reboot or anything like that.) + 3. Log in again. + 4. Start a guest session. + + Result: Depends on Xorg server in use. With intel driver, the guest Xorg + session fails to start up with a DRM permission error (see attached + Xorg.1.log). With virtualbox, and possibly AMD proprietary driver, the + Xorg session on :1 appears to fight the one on :0 for control of the + framebuffer - windows from both desktops get drawn over each other, + causing a big mess. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: lightdm 1.9.3-0ubuntu1 ProcVersionSignature: Ubuntu 3.12.0-4.12-generic 3.12.1 Uname: Linux 3.12.0-4-generic x86_64 ApportVersion: 2.12.7-0ubuntu1 Architecture: amd64 CurrentDesktop: Unity Date: Fri Nov 29 01:41:28 2013 InstallationDate: Installed on 2013-11-29 (0 days ago) InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20131128) SourcePackage: lightdm UpgradeStatus: No upgrade log present (probably fresh install) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1256150 Title: Xorg guest session fails to start if the user has logged out and logged in again To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1256150/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs