From: ed@somewhere.in.the.uk   
      
   Frank Slootweg wrote:   
   > Paul  wrote:   
   >> On Sat, 2/7/2026 2:39 PM, Frank Slootweg wrote:   
   >>> Paul  wrote:   
   >>>> On Sat, 2/7/2026 11:16 AM, Frank Slootweg wrote:   
   >>> [...]   
   >>>>>    BTW, a minor correction to earlier information: I said that when the   
   >>>>> 'power' LED of the machine is off, it's safe to disconnect power, but on   
   >>>>> my wife's Mini-PC I saw that that LED also turns off when the machine is   
   >>>>> sleeping, so - at least on that machine - it's not just a simple *power*   
   >>>>> LED.   
   >>>>   
   >>>> Isn't there supposed to be a flashing LED during (pure) sleep ?   
   >>>>   
   >>>> There should be some indication that the machine is in a   
   >>>> fragile state (like, don't turn off the power on the back).   
   >>>   
   >>>    That apparently depends on the implementation.   
   >>>   
   >>>    On all my laptops since the late 90s, there always was a blinking   
   >>> power LED when the laptop was sleeping. That's still the case on my   
   >>> current Windows 11 laptop (but the LED is in a key on the keyboard, so   
   >>> not visible when the lid is closed, which is a bit of a pain).   
   >>>   
   >>>    But on my wife'd Mini-PC, the 'power' LED is off in sleep and in   
   >>> hibernation (and obviously when disconnected from power).   
   >>>   
   >>>> Perhaps what a LED-off indicates, is the machine is in   
   >>>> Hybrid Sleep, and removing the power does no permanent damage   
   >>>> (the hiberfil.sys has the session). Just the loading time will   
   >>>> be a bit longer on the next button push.   
   >>>   
   >>>    I don't think that my wife's Min-PC is using Hybrid Sleep, because a   
   >>> manual Sleep is near instant, while a Hibernate takes some noteable   
   >>> time. A wake from sleep is fast as well, but because the monitor is also   
   >>> sleeping, you can't tell which one wakes faster, the computer or the   
   >>> monitor.   
   >>>   
   >>>    But please remind me how I can check if the system can use Hybrid   
   >>> Sleep, if it's enabled and if it's actually Hybrid Sleeping. Thanks.   
   >>   
   >> I don't think Hybrid Sleep is an ACPI state. There is just S3.   
   >>   
   >> powercfg /a   
   >> The following sleep states are available on this system:   
   >>      Standby (S3)   
   >>      Hibernate     <=== should have labeled as S4   
   >>      Hybrid Sleep   
   >>      Fast Startup   
   >>   
   >> The following sleep states are not available on this system:   
   >>      Standby (S1)   
   >>          The system firmware does not support this standby state.   
   >>   
   >>      Standby (S2)   
   >>          The system firmware does not support this standby state.   
   >>   
   >>      Standby (S0 Low Power Idle)   
   >>          The system firmware does not support this standby state.   
   >>   
   >> Nothing in a menu, hints at whether Sleep or Hybrid Sleep   
   >> is about to be used when Sleep is selected. You'd just have   
   >> to watch the disk LED to figure it out.   
   >>   
   >>     Paul   
   >   
   >    It looks like a system either has Hybrid Sleep or it hasn't. If it   
   > has, there's a 'Allow Hybrid Sleep' setting in the 'Sleep' section of   
   > the 'Power Options' Control Panel applet [1].   
   >   
   >    Hybrid Sleep is not present on my laptop, nor on my wife's Mini-PC.   
   > For my wife's Mini-PC, 'powercfg /a' says:   
   >   
   > The following sleep states are available on this system:   
   >      Standby (S3)   
   >      Hibernate   
   >      Fast Startup   
   >   
   > The following sleep states are not available on this system:   
   >      Standby (S1)   
   > 	The system firmware does not support this standby state.   
   >   
   >      Standby (S2)   
   > 	The system firmware does not support this standby state.   
   >   
   >      Standby (S0 Low Power Idle)   
   > 	The system firmware does not support this standby state.   
   >   
   >      Hybrid Sleep   
   > 	The hypervisor does not support this standby state.   
   >   
   >    So it doesn't have 'Hybrid Sleep'. Also 'Sleep' is apparently just   
   > old-fashioned 'Standby (S3)', not 'Standby (S0 Low Power Idle)' (also   
   > known as Modern Standby) (which my laptop *does* have).   
   >   
   >    Bottom line: My wife's Mini-PC just does a normal Sleep, not a Hybrid   
   > Sleep, So it's strange that the 'power' LED goes off during Sleep, but   
   > it does.   
   >   
   > [1] See for example the screenshot of the 'Power Options' applet near   
   > the bottom of this page:   
   >   
   >    
      
   You'd be well advised to bring Fast Startup into your considerations.   
   It hibernates the kernel session to hiberfil.sys, acting as a kind of   
   hybrid shutdown.   
      
   Ed   
      
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