XPost: alt.comp.os.windows-11   
   From: nospam@needed.invalid   
      
   On Sat, 1/24/2026 8:29 PM, Jeff Barnett wrote:   
   > On 1/24/2026 5:37 PM, ...w¡ñ§±¤ñ wrote:   
   >> Jeff Barnett wrote on 1/24/2026 12:56 PM:   
   >>> On 1/24/2026 10:07 AM, ...w¡ñ§±¤ñ wrote:   
   >>>> Jeff Barnett wrote on 1/24/2026 9:07 AM:   
   >>>>> On 1/23/2026 12:44 AM, ...w¡ñ§±¤ñ wrote:   
   >>>>>> micky wrote on 1/22/2026 4:26 PM:   
   >>>>>>>   
   >>>>>>> I suppose most of the readers of these newsgroups know that for a full   
   >>>>>>> start from scratch it's required to run Restart, instead of Shutdown   
   >>>>>>> followed by starting later.  Even though I only learned this a year   
   ago   
   >>>>>>> and even though it's a bit counter-intuitive, you all know that, right,   
   >>>>>>> (because if you're running with Fast Startup*** shutdown saves the   
   >>>>>>> kernel and reuses it, but Restart never uses Fast Startup and it   
   >>>>>>> rebuilds the kernel, with new values if the values have changed).   
   >>>>>>>   
   >>>>>>> But maybe you did not know that you can get the benefit of Restart and   
   >>>>>>> still turn your machine off if you press Shift while clicking on   
   >>>>>>> Shutdown.   How about that!!   
   >>>>>>>   
   >>>>>>   
   >>>>>> If Hibernation (and by extension, Fast Startup) is disabled (e.g., via   
   powercfg -h off), the "Shutdown" button functions as a full, traditional   
   shutdown - clears the system state(shuts down all processes) and clears temp   
   memory and powers Off.    
   Subsequent Powering on, re-initializes the o/s   
   >>>>>>   - which, incidentally is the same results as Shift-Shutdown.   
   >>>>>>   i.e. you don't need to the keystroke combo if Hibernation is   
   disabled.   
   >>>>>>   
   >>>>>> Restart(when Hiberation is disabled) does the exact same clearing but   
   instead of shutting down, powers the device back on and re- initializes the   
   o/s.   
   >>>>> I have Hibernation set to never in my power profile. However, I have an   
   APC UPS that will hibernate the machine in case of an extended power outage;   
   in other words, the APC software is able to work around that setting. Does   
   this setup change    
   anything said in this thread so far?   
   >>>>   
   >>>> Afaik, the UPS Hibernation feature requires enabling Windows hibernation.   
   >>>>   i.e. When a power outage occurs, the UPS has to communicate with   
   Windows and validate Windows hibernation state(enabled/disabled), if enabled   
   instruct Windows to hibernate, once done the UPS provides backup battery power   
   for the duration of its    
   capability.   
   >>>>   
   >>>> Lacking Windows hibernation, the UPS only provides battery power for the   
   device(and Windows) for the duration of its backup battery capability.   
   >>>>    - no Windows hibernation   
   >>>   
   >>> I've not enabled hibernation (as said above) but the APC software seems to   
   be able to do it anyway. Perhaps it changes the power profile when necessary.   
   I remember one of the disk tester/diagnostic packages that turned sleep off   
   when it was called    
   and never bothered to restore it on its way out. So there is certainly some   
   way to diddle the settings.   
   >>   
   >> See Paul's response, that echo's my input.   
   >>   => Hibernation needs to be enabled in Windows.   
   >   
   > I believe (from my own experience) that Paul is incorrect in this specific   
   case. The APC software (OS level stuff) can when it decides it's time to   
   shutdown because of battery drain, etc, can arrange that hibernation works   
   whether the user has enabled    
   it or not. I've noted it's happening a few times.   
      
   I think there has to be a hiberfile (C:\hiberfil.sys) and   
   it is typically equal in size to 50% of memory or a larger   
   percentage. Via compression, the RAM content written out to   
   the hiberfile is smaller than the physical size. Most sessions   
   on Windows are quite small, so only a fraction of the reserved   
   hiberfile space is used.   
      
      powercfg /a     # check supported ACPI states.   
                      # Hibernation is S4. Mine is disabled right now.   
                      # A   shutdown /h   would generate an error of some sort.   
      
      powercfg /h on  # Add Hibernation, then verify with the first command   
                      # Check for hidden file on the root of C: with dir /ah in   
   command prompt   
      
   There is also some procedure at startup, which may be writing   
   something to the header of the hiberfile. The hiberfile is "invalidated"   
   as part of startup, such that it cannot be reused immediately to   
   restore the same session ("like it was GroundHog day").   
      
   Otherwise, without using the hibernation feature, little in the   
   way of wear, happens because of the existence of the hiberfile.   
      
   If you were installing the APC software, it is possible there is   
   sufficient elevation at install time, for the APC software to be   
   using powercfg and switching the hiberfile on and reserving the   
   necessary space.   
      
   Once the hiberfile exists, the normal set of system commands   
   should work, to generate a hiberfile. The command from the UPS   
   should be terse -- it isn't always a super-intelligent processing   
   thing. Any application loaded into the host OS, has to do the   
   more intelligent part. The UPS should not be sending this   
   command, as written. That would be an exploit waiting to happen.   
      
      shutdown /h   
      
     Paul   
      
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