As I said, the fact that booting a different kernel makes the difference between "works" and "fails" is certainly indicative of a bug between acpid and kernel.
Could others test if using an older kernel helps ? -- Xorg exits when it receives an ACPI button/lid event https://launchpad.net/bugs/61746 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
