An anonymous reader writes "The Linux 3.15 kernel that is now in its early life will be able to suspend and resume much faster than previous versions of the Linux kernel. Days ago were ACPI and Power Management updates that enable asynchronous threads for more suspend and resume callbacks. Carrying out more async operations leads to reduced time for the system suspend and then resuming. According to one developer it was about an 80% time savings within one of the phases. Merged on Friday was then work so that the kernel is no longer blocked by waiting for ATA devices to resume. Multiple ATA devices can be waked up simultaneously and any ATA commands for the device(s) will be queued until they have powered up. According to an 01.org blog post on the ATA/SCSI resume optimization patches, when tested on three Intel Linux systems the resume time was between seven and 12x faster (not including the latest ACPI/PM S&R optimizations)."
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