Affects me as well.

Dell Precision M6600
64 bit Ubuntu 11.04 Ubuntu 11.10

The laptop was on bios A03 which I updated to A07 and disabled "c state
control" in bios after a few attempts but still no joy.

Removing the AC connector before issuing the shutdown command within
gnome did allow for a clean power down.  Later, I stopped acpi-support
but left AC connected and the system also successfully powered down.

I'm currently running 64 bit 11.04.  I'd consider going back to 10, but
it EOL next month.

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https://bugs.launchpad.net/bugs/882817

Title:
  shutdown screen stuck after upgrade to Ubuntu 11.10

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