** Attachment added: "Log with intel driver"
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1256150/+attachment/3919454/+files/Xorg.1.log
** Description changed:
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.
+ (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)
** Description changed:
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)
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https://bugs.launchpad.net/bugs/1256150
Title:
Xorg guest session fails to start if the user has logged out and
logged in again
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