On Fri, Mar 30, 2012 at 1:49 PM, Len Brown <lenb@xxxxxxxxxx> wrote: > Why? 1) To support something like pm-qos. power off device may have more exit.latency than normal low power state (such as D3Hot). Some device may disable may_power_off based on that. It can be used to implement the logic like, only power off SSD, not HDD. 2) Whether to go to power off should be determined by leaf device (such as SATA disk), but that may be done by its parent device (such as SATA port). It's a way for leaf device to tell its parent device whether it want to go to power off. Best Regards, Huang Ying -- 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
