Lê Kiến Trúc, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .
If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report: apport-collect -p linux <replace-with-bug-number> Also, could you please test the latest upstream kernel available (not the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags: kernel-fixed-upstream kernel-fixed-upstream-VERSION-NUMBER where VERSION-NUMBER is the version number of the kernel you tested. For example: kernel-fixed-upstream-v3.13-rc3 This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag: needs-upstream-testing If the mainline kernel does not fix this bug, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-VERSION-NUMBER As well, please remove the tag: needs-upstream-testing Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding. ** This bug is no longer a duplicate of bug 546578 black screen after a few user switches ** Package changed: nvidia-graphics-drivers (Ubuntu) => linux (Ubuntu) ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Changed in: linux (Ubuntu) Status: Confirmed => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to nvidia-graphics-drivers in Ubuntu. https://bugs.launchpad.net/bugs/561538 Title: Logout after switch user cause black screen Status in “linux” package in Ubuntu: Incomplete Bug description: [Copycat - A blackscreen can also appear due to a bug in the ATI driver - workaround involving gnome-screensaver. (goto bug #546578)] Binary package hint: nvidia-graphics-drivers I have this bug on both my computer and my laptop. This effect me scine Ubuntu Lucid 10.04 alpha to now Beta 2 with all upgrade. Steps to reproduce: 1. Login to user A. 2. Choose switch user from User A. 3. Login to user B. 4. Logout from user B. After that the screen just go blank. The music from Rhythmbox of user A still playing, I can't swith to tty1 (by ctrl + alt + F1), but I can use the Magic SysRq key to reboot the system. In my laptop it's usally happen, it rarely happen but exist in my computer. I think this bug is very critical because I need to use many user for testing application and translation of ubuntu. There aren't any logs in my computer (except something about Pulse before the crash). And in my laptop has some logs From kern.log Apr 12 20:06:47 truclk60145 kernel: [ 294.139885] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id From the daemon.log Apr 12 20:06:28 truclk60145 gdm-simple-slave[1994]: WARNING: Unable to load file '/etc/gdm/custom.conf': No such file or directory Apr 12 20:06:29 truclk60145 acpid: client 1137[0:0] has disconnected Apr 12 20:06:29 truclk60145 acpid: client connected from 1997[0:0] Apr 12 20:06:29 truclk60145 acpid: 1 client rule loaded Apr 12 20:06:32 truclk60145 gdm-session-worker[2037]: WARNING: Unable to load file '/etc/gdm/custom.conf': No such file or directory Apr 12 20:06:32 truclk60145 rtkit-daemon[1498]: Sucessfully made thread 2040 of process 2040 (n/a) owned by '114' high priority at nice level -11. Apr 12 20:06:32 truclk60145 rtkit-daemon[1498]: Supervising 4 threads of 2 processes of 2 users. Apr 12 20:06:32 truclk60145 gdm-simple-greeter[2032]: Gtk-WARNING: /build/buildd/gtk+2.0-2.20.0/gtk/gtkwidget.c:5636: widget not within a GtkWindow Apr 12 20:06:33 truclk60145 rtkit-daemon[1498]: Sucessfully made thread 2045 of process 2040 (n/a) owned by '114' RT at priority 5. Apr 12 20:06:33 truclk60145 rtkit-daemon[1498]: Supervising 5 threads of 2 processes of 2 users. Apr 12 20:06:33 truclk60145 rtkit-daemon[1498]: Sucessfully made thread 2047 of process 2040 (n/a) owned by '114' RT at priority 5. Apr 12 20:06:33 truclk60145 rtkit-daemon[1498]: Supervising 6 threads of 2 processes of 2 users. Apr 12 20:06:33 truclk60145 gdm-session-worker[2037]: GLib-GObject-CRITICAL: g_value_get_boolean: assertion `G_VALUE_HOLDS_BOOLEAN (value)' failed Apr 12 20:06:36 truclk60145 rtkit-daemon[1498]: Sucessfully made thread 2140 of process 2140 (n/a) owned by '1001' high priority at nice level -11. Apr 12 20:06:36 truclk60145 rtkit-daemon[1498]: Supervising 7 threads of 3 processes of 3 users. Apr 12 20:06:37 truclk60145 rtkit-daemon[1498]: Sucessfully made thread 2178 of process 2140 (n/a) owned by '1001' RT at priority 5. Apr 12 20:06:37 truclk60145 rtkit-daemon[1498]: Supervising 8 threads of 3 processes of 3 users. Apr 12 20:06:37 truclk60145 rtkit-daemon[1498]: Sucessfully made thread 2179 of process 2140 (n/a) owned by '1001' RT at priority 5. Apr 12 20:06:37 truclk60145 rtkit-daemon[1498]: Supervising 9 threads of 3 processes of 3 users. Apr 12 20:06:37 truclk60145 rtkit-daemon[1498]: Sucessfully made thread 2190 of process 2190 (n/a) owned by '1001' high priority at nice level -11. Apr 12 20:06:37 truclk60145 rtkit-daemon[1498]: Supervising 10 threads of 4 processes of 3 users. Apr 12 20:06:47 truclk60145 acpid: client 1997[0:0] has disconnected Apr 12 20:06:47 truclk60145 acpid: client connected from 1137[0:0] Apr 12 20:06:47 truclk60145 acpid: 1 client rule loaded From the debug Apr 12 20:06:32 truclk60145 rtkit-daemon[1498]: Supervising 4 threads of 2 processes of 2 users. Apr 12 20:06:33 truclk60145 rtkit-daemon[1498]: Supervising 5 threads of 2 processes of 2 users. Apr 12 20:06:33 truclk60145 rtkit-daemon[1498]: Supervising 6 threads of 2 processes of 2 users. Apr 12 20:06:36 truclk60145 rtkit-daemon[1498]: Supervising 7 threads of 3 processes of 3 users. Apr 12 20:06:37 truclk60145 rtkit-daemon[1498]: Supervising 8 threads of 3 processes of 3 users. Apr 12 20:06:37 truclk60145 rtkit-daemon[1498]: Supervising 9 threads of 3 processes of 3 users. Apr 12 20:06:37 truclk60145 rtkit-daemon[1498]: Supervising 10 threads of 4 processes of 3 users. 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