On Tue, Jan 22, 2013 at 03:09:01AM +0100, Rafael J. Wysocki wrote: > From: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> > > The ACPI specification requires the _PSC method to be present under > a device object if its power state cannot be inferred from the states > of power resources used by it (ACPI 5, Section 7.6.2). However, it > also requires that (for power states D0-D2 and D3hot) if the _PSn > (n = 0, 1, 2, 3) method is present under the device object, it also > must be executed after the power resources have been set > appropriately for the device to go into power state Dn (D3 means > D3hot in this case). Thus it is not clear from the specification > whether or not the _PSn method should be executed if the initial > configuraion of power resources used by the device indicates power > state Dn and the _PSC method is not present. > > The current implementation of acpi_bus_init_power() is based on the > assumption that it should not be necessary to execute _PSn in the > above situation, but experience shows that in fact that assumption > need not be satisfied. For this reason, make acpi_bus_init_power() > always execute _PSn if the initial configuration of device power > resources indicates power state Dn. > > Reported-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> You can add also, Tested-by: Mika Westerberg <mika.westerberg@xxxxxxxxxxxxxxx> if you like. Thanks for fixing this. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
