The resulting scheme-which other PC makers do not use, for the most part-is called Modern Standby. They only support S0ix sleep states in these devices, plus a hibernation fallback that is enabled after two hours by default. What’s unique about Surface Book and Surface Pro 4, however, is that Microsoft decided to live on the leading edge. “Win32 applications can misbehave and refuse to go into the virtual S3 state preventing the device to go into S0iX which causes the power drain,” he notes, referencing what we’ve come to think of as “hot bagging.” “Also, with SkyLake, Intel struggled with getting their SoCs to enter into DRIPs which allows for the lowest power levels.” So these applications are “forced into a virtual S3 State.” As the Surface MVP referenced above notes, there’s an additional complication when using this technology in Windows, because desktop (Win32) applications are not compatible. Surface Book and Surface Pro 4 are S0ix-enabled. In other words, it can be very efficient. And from a hardware perspective, it means that the S0ix states can in fact shut off parts of Intel “chipset,” as think of it-it’s really a System on a Chip or SoC design-when they are not in use. What this means is that S0ix-enabled PCs can “drip” data to the device-new email, notifications, software updates-even while it is sleeping. There’s also an S0 state, where the PC is simply powered on normally.īut the newest Intel chipsets, including Skylake, also offer a special set of S0i”x” sleep states, including the Powered On Low Power State, which allows the PC to work much like an ARM-based phone or tablet. Modern, Intel-based PCs support a variety of power management sleep states (S1 to S5, where S3 is “Suspend to RAM” and S4 is “Hibernate”). (Bear with me, this isn’t an area of expertise.) So here’s the synopsis, as I understand it. But they knew that when Microsoft and Intel fixed the issues with Windows 10 and Skylake processors, they could then offer this advanced sleep state as a firmware upgrade, giving additional value to customers. HP did not rely on the same power management scheme that Microsoft used for Surface because they knew it was broken.A Surface for IT Pros blog post and video that we referenced in yesterday’s Windows Weekly.Some useful comments by a Surface MVP in a support forum.Microsoft’s original forum-based declaration that the Surface power management issues were a “very hard computer science problem.”.Here, I’m relying on three sources that are worth checking out independently, plus one that was a private conversation with a PC maker:
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