I activated acpi on my IBM Thinkpad T40p. ACPI it meant for device enumaration only and, indeed, the power saving functions nor the battery applet did work.
Inspecting /var/log/messages I found:
Nov 1 14:26:09 ibmLaptop kernel: ACPI-0178: *** Warning: The ACPI AML in your computer contains errors, please nag the manufacturer to correct it. Nov 1 14:26:09 ibmLaptop kernel: ACPI-0181: *** Warning: Allowing relaxed access to fields; turn on CONFIG_ACPI_DEBUG for details. Nov 1 14:26:09 ibmLaptop kernel: ACPI: Interpreter enabled
Is the AML (ACPI Machine Language) issue related to the DSDT issues, which has been reported here several times? I couldn't determine it based on the information I found on the ACPI project pages and INTEL's.
And how to correct it or is it even necessary to correct? I suppose a kindly letter for Mr. Palmisano will not help so much :-).
Regards Peter