\nHybrid sleep<\/i>\nis a type of sleep state that combines\nsleep<\/i> and hibernate<\/i>.\nWhen you put the computer into a hybrid sleep state,\nit writes out all its RAM to the hard drive\n(just like a hibernate),\nand then goes into a low power state that keeps RAM refreshed\n(just like a sleep).\nThe idea is that you can resume the computer quickly from sleep,\nbut if there is a power failure or some other catastrophe,\nyou can still restore the computer from hibernation.\n<\/p>\n
\nA hybrid sleep can be converted to a hibernation by simply\nturning off the power.\nBy comparison, a normal sleep requires resuming the computer\nto full power in order to write out the hibernation file.\nBack in the Windows XP days,\nI would sometimes\nsee the computer in the next room spontaneously\nturn itself on:\nI’m startled at first, but then I see on the screen that\nthe system is hibernating, and I understand what’s going on.\n<\/p>\n
\nHybrid sleep is on by default for desktop systems\nbut off by default on laptops.\nWhy this choice?\n<\/p>\n
\nFirst of all, desktops are at higher risk of the power outage\nscenario wherein a loss of power (either due to a genuine\npower outage or simply unplugging the computer by mistake)\ncauses all work in progress to be lost.\nDesktop computers typically don’t have a backup battery,\nso a loss of power means instant loss of sleep state.\nBy comparison, laptop computers have a battery which can\nbridge across power outages.\n<\/p>\n
\nFurthermore, laptops have a safety against battery drain:\nWhen battery power gets dangerously low,\nit can perform an\n\nemergency hibernate<\/a>.\n<\/p>\n \nLaptop manufacturers also requested that hybrid sleep be off\nby default.\nThey didn’t want the hard drive to be active for a long time\nwhile the system is suspending,\nbecause when users suspend a laptop, it’s often in the form of\n“Close the lid, pick up the laptop from the desk,\nthrow it into a bag, head out.”\nPerforming large quantities of disk I\/O at a moment when the\ncomputer is physically being jostled around increases the risk\nthat one of those I\/O’s will go bad.\nThis pattern doesn’t exist for desktops: When you suspend a desktop\ncomputer, you just leave it there and let it do its thing.\n<\/p>\n \nOf course, you can override this default easily from the Control Panel.\nUnder Power Options<\/i>, select\nChange plan settings<\/i>,\nthen\nChanged advanced power settings<\/i>,\nand wander over into the Sleep<\/i> section of the configuration tree.\n<\/p>\n \nIf you’re a command line sort of person,\nyou can use this insanely geeky command line to enable hybrid\nsleep when running on AC power in Balanced mode:\n<\/p>\n \n(All one line. Take a deep breath.)\n[Update<\/b>: Or you can use\n \nOkay, what do all these insane options mean?\n<\/p>\n \n \nThe next part is a GUID, specifically, the GUID that represents\nthe balanced power scheme.\nIf you want to modify the setting for a different power scheme,\nthen substitute that scheme’s GUID.\n<\/p>\n \nAfter the scheme GUID comes the subgroup GUID.\nHere, we give the GUID for the Sleep subgroup.\n<\/p>\n \nNext we have the GUID for the Hybrid Sleep setting.\n<\/p>\n \nFinally, we have the desired new value for the setting.\nAs you might expect, 1 enables it and 0 disables it.\n<\/p>\n \nAnd where did these magic GUIDs come from?\nRun the \nBonus reading<\/b>:\n<\/p>\n Hybrid sleep is a type of sleep state that combines sleep and hibernate. When you put the computer into a hybrid sleep state, it writes out all its RAM to the hard drive (just like a hibernate), and then goes into a low power state that keeps RAM refreshed (just like a sleep). The idea […]<\/p>\n","protected":false},"author":1069,"featured_media":111744,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[2,104],"class_list":["post-10703","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oldnewthing","tag-history","tag-tipssupport"],"acf":[],"blog_post_summary":" Hybrid sleep is a type of sleep state that combines sleep and hibernate. When you put the computer into a hybrid sleep state, it writes out all its RAM to the hard drive (just like a hibernate), and then goes into a low power state that keeps RAM refreshed (just like a sleep). The idea […]<\/p>\n","_links":{"self":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/10703","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/users\/1069"}],"replies":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/comments?post=10703"}],"version-history":[{"count":0,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/posts\/10703\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media\/111744"}],"wp:attachment":[{"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/media?parent=10703"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/categories?post=10703"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devblogs.microsoft.com\/oldnewthing\/wp-json\/wp\/v2\/tags?post=10703"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\npowercfg -setacvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e\n 238c9fa8-0aad-41ed-83f4-97be242c8f20\n 94ac6d29-73ce-41a6-809f-6363ba21b47e 1\n<\/pre>\n
powercfg -setacvalueindex SCHEME_BALANCED SUB_SLEEP HYBRIDSLEEP 1<\/code>,\nas pointed out by\n\nRandom832<\/a>.\nI missed this because the ability to substitute aliases is not mentioned\nin the -setacvalueindex<\/code> documentation.\nYou have to\n\ndig into the -aliases<\/code> documentation<\/a> to find it.]\n<\/p>\n-setacvalueindex<\/code> sets the behavior when running on AC power.\nTo change the behavior when running on battery, use\n-setdcvalueindex<\/code> instead.\nOkay, that was easy.\n<\/p>\npowercfg -aliases<\/code> command to see all the GUIDs.\nYou can also run powercfg -q<\/code> to view all the settings\nand their current values in the current power scheme.\n<\/p>\n\n