compiz team mailing list archive

[Robert Ancell <robert.ancell@xxxxxxxxxxxxx>]

What I suspect is happening here is the lightdm daemon has crashed.  When it does that CK automatically deletes the ConsoleKit sessions it owned so even though the session and X server continue to run you wont have permission to access things anymore.  You can confirm this by running: 
$ sudo killall -SIGABRT lightdm
You will have to kill the X server after this and run sudo start lightdm to recover.

The question is, what has caused the lightdm daemon to crash and why
hasn't apport restarted it / gone into failsafe X mode?

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https://bugs.launchpad.net/bugs/851345

Title:
  compiz crashes on i915 graphic module with GLX_EXT_texture_from_pixmap
  is missing

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