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.
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.