system). (As a consequence, the patch makes the PnP ACPI code more ACPI compliant.) Section 6.2.2 of the ACPI Specification (at least versions 1.0b and 3.0a) states: "Prior to running this control method [_DIS], the OS[PM] will have already put the device in the D3 state." Unfortunately, there is no clear statement as to when to put a device in the D0 state. :-( Therefore, the patch executes the method calls as _PS3/_DIS and _SRS/_PS0. What is clear: "If the device is disabled, _SRS enables the device at the specified resources." (From the ACPI 3.0a Specification.) The patch fixes a problem with some IBM ThinkPads (at least the 600E and the 600X) where the serial ports have a dedicated power source that needs to be brought up before the serial port can be used. Without this patch, the serial port is enabled but has no power. (In the past, the tpctl utility had to be utilized to turn on the power, but support for this feature stopped with version 5.9 as it did not support the more recent kernel versions.) The error handlers that handle any errors that can occur during the power up/power down phases return the error codes to the caller directly. Comments welcome! :-) No regressions were observed on hardware that does not require this patch. The patch is applied against 2.6.27.x. Signed-off-by: Witold Szczeponik Acked-by: Zhao Yakui Signed-off-by: Len Brown .ÚØ”—