I have almost the same issue since I installed Lucid Lynx : when I disconnect as a user I get a black screen and the only thing I can do is reboot with Alt+SysRq+B. It happened twice out of two trials.
Here is the tail of my Xorg.0.log.old, I suppose to be related with this issue : (**) Macintosh mouse button emulation: Applying InputClass "evdev pointer catchall" (**) Macintosh mouse button emulation: always reports core events (**) Macintosh mouse button emulation: Device: "/dev/input/event2" (II) Macintosh mouse button emulation: Found 3 mouse buttons (II) Macintosh mouse button emulation: Found relative axes (II) Macintosh mouse button emulation: Found x and y relative axes (II) Macintosh mouse button emulation: Configuring as mouse (**) Macintosh mouse button emulation: YAxisMapping: buttons 4 and 5 (**) Macintosh mouse button emulation: EmulateWheelButton: 4, EmulateWheelInertia: 10, EmulateWheelTimeout: 200 (II) XINPUT: Adding extended input device "Macintosh mouse button emulation" (type: MOUSE) (II) Macintosh mouse button emulation: initialized for relative axes. (II) config/udev: Adding input device Macintosh mouse button emulation (/dev/input/mouse0) (II) No input driver/identifier specified (ignoring) (II) Power Button: Close (II) UnloadModule: "evdev" (II) Power Button: Close (II) UnloadModule: "evdev" (II) AT Translated Set 2 keyboard: Close (II) UnloadModule: "evdev" (II) ImPS/2 Logitech Wheel Mouse: Close (II) UnloadModule: "evdev" (II) Macintosh mouse button emulation: Close (II) UnloadModule: "evdev" (II) Open ACPI successful (/var/run/acpid.socket) (II) APM registered successfully (II) NVIDIA(0): Initialized GART. (WW) NVIDIA(0): WAIT (2, 6, 0x8000, 0x00000300, 0x000003cc) (WW) NVIDIA(0): WAIT (1, 6, 0x8000, 0x00000300, 0x000003cc) (II) NVIDIA(0): Setting mode "nvidia-auto-select" (WW) NVIDIA(0): WAIT (2, 1, 0x8000, 0x00000300, 0x0000046c) (WW) NVIDIA(0): WAIT (1, 1, 0x8000, 0x00000300, 0x0000046c) (WW) NVIDIA(0): WAIT (2, 3, 0x8000, 0x00000300, 0x00000880) (WW) NVIDIA(0): WAIT (1, 3, 0x8000, 0x00000300, 0x00000880) (WW) NVIDIA(0): WAIT (2, 11, 0x8000, 0x00000300, 0x000008a0) (WW) NVIDIA(0): WAIT (1, 11, 0x8000, 0x00000300, 0x000008a0) As you can see I have a NVidia video card (an old one). CPU : AMD Barton. -- Logout after switch user cause black screen https://bugs.launchpad.net/bugs/561538 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
