When running dmesg, the output is a long list of the following:
ACPI Error: No object attached to node 0xffffff00016622e0 20090521 exresnte-211
ACPI Error (uteval-0329): Method execution failed [\_SB_.PCI0.SBRG.EC__.BAT1._HID] (Node 0xffffff00016622e0), AE_AML_NO_OPERAND
As a workaround I resort to sysctl, which gives similar information, but is there a resolution to this?