Public bug reported:
When switching to a guest session, or to a different user, the system
often freezes. At times this also happens when terminating a guest
session. Ctrl+Alt+Fn and Ctrl+Alt+Del dont have any effect, and
apparently also SysReq+key. The only way of regaining control is to
switch off and on the PC with the power button.
My PC has an Intel Core i5 CPU 760 @ 2.80GHz × 4 with 8GB of RAM, a
450GB hard disk, and an Nvidia Quadro 400 graphics card. I'm running 64
bit Ubuntu 12.10 with the Noveau drivers.
** Affects: ubuntu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1129486
Title:
System freezes when switching to guest session or other user
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