Windows 8 Sleep Mode
The first thing to realize is there are lots of setting controlling Windows 8's sleep and hibernation. It follows that people experience a wide range of hibernating related problems.
My point is that you have to work hard to find a description of the exact same sleep predicament that you are troubleshooting, but don't worry, I have lots of scenarios to help you understand Windows 8's snoozing habits.
In a nutshell, Windows 8's new hybrid boot technology results in a more responsive awakening from sleep than experienced in previous Microsoft operating systems.
Finding the Power switch in the New UI is a little different from the classic Windows 7 start menu. Typical Microsoft, there are at least 2 ways of causing a machine to slumber!
My favourite method is activating the Metro 'Charms' with Winkey +c, then choosing 'Settings'. You should see the Power switch at the bottom right - see screenshot. Chris points out that WinKey +i would be quicker.
A sleeping computer awakens quicker than if you set the same machine set to hibernate. The price to pay is that a sleeping computer could lose unsaved data if someone turns it off, this is because the information is stored in RAM, which is cleared if the operating system powers down.
Although a hibernating machine takes longer to return to its previous state, the data is safe because it reloads the contents of a physical file called hiberfil.sys into memory. Consequently, if your spouse accidentally turned off your machine while it was hibernating your data would still be just as when you left it. Another benefit of hibernation is that it consumes less power than sleep mode.
One more point, Windows 8 also has a setting called 'Hybrid boot', which combines the speed of sleep with the data security of hibernate.
Encouraging computers to sleep when they're not in use is a great idea - until you are away from your desk and need a file on that remote sleeping machine!
WOL also has business uses for example, rousing machines so that they can have update patches applied. My real reason for recommending you download this free tool is because it's so much fun sending those 'Magic Packets'. Give WOL a try - it's free.
Microsoft provides 4 methods of finding the Windows 8 Power Settings:
B: Search Settings
Plan C: Windows 8 PowerCFG
Plan D: (Only if you have battery!)
Before you start changing the Power settings consider what you want to achieve, for example, conserving the battery, changing the Power Button options, altering the wake-up triggers, or simply improving security when you are away from the machine.
Start your troubleshooting here: Control Panel -> Hardware and Sound -> Power Options.
Tip: Even experienced users forget the significance of 'Change settings that are currently unavailable'. Keep this link in mind if a setting is greyed out.
Click on 'Choose what the power button does' - Key step, see menu above.
This is where you can control what happens when the laptop's lid closes, or when you press the Power button. If your setting is 'Greyed out', then remember my tip and click on: 'Change settings that are currently unavailable'.
While I only show the 'On battery' setting, you can also decide what happens if the laptop is plugged in. Windows 8 has sensors that can detect a mains supply, and when the mains is turned off the operating system connects instantly to the battery, and then applies the appropriate power management settings.
SolarWinds' Orion performance monitor will help you discover what's happening on your network. This utility will also guide you through troubleshooting; the dashboard will indicate whether the root cause is a broken link, faulty equipment or resource overload.
What I like best is the way NPM suggests solutions to network problems. Its also has the ability to monitor the health of individual VMware virtual machines. If you are interested in troubleshooting, and creating network maps, then I recommend that you try NPM now.
As you adjust the Power options settings as shown on the right, visualize the 'Power' button below.
If sleep does not appear then check your BIOS settings. If still no 'Sleep' option, then my guess is that your display driver does not support this mode. Still stuck? Go back to 'Choose what the power button does' link.
Power Options --> 'Choose what the power button does' is where you can enable or disable the new Hybrid Boot, this recommended setting halves the time Windows takes to reach the initial logon screen, largely because the Windows core processes retrieve hibernated files, where as drivers rely on a cold boot. However, for troubleshooting you can turn off Enable Hybrid Boot see above screenshot.
Footnote: Hybrid boot is a separate factor from sleep.
Why Computers Need to Sleep!
For laptop users conserving the battery is a priority. Even for a desktop computer if it's not use, then there are benefits from managing its power settings; namely, reducing electricity charges, peace and quiet, and in the summer, helping to keep the room cool.
When I work with the graphics at maximum brightness, my Sony Vaio's battery only lasts for about 2hrs. Therefore, anything that I can do to conserve battery power, will increase the time I can use my laptop away from the mains electricity.
Key Item: 'Change advanced power settings'
Please remember: Change settings that are currently unavailable.
Windows 8 Sleep and Hibernation
To observe hiberfil.sys, and check its size, you may need to adjust the Windows Explorer's settings. What I do is go to the Control Panel, Appearance and Personalization, then 'Show hidden files and folders'. Plan B call for PowerShell and type gci c:\ -hidden.
Once you understand the role of hiberfil.sys, then you appreciate why the Hibernation setting may NOT be present on the menu. For example, if there is insufficient disk space on the C: drive, or ancient BIOS software lacks the ability to 'Suspend to disk' or 'Suspend to RAM'. Another gotcha with the Hibernate option, is that Disk Cleanup deletes the hiberfil.sys file. A solution to this recurring problem is to go to the command line, and type: powercfg -h on.
Incidentally, I discovered that while you cannot move hiberfil to a different volume, you can restrict it's size. Once again it's a task for powercfg, this time you need the -size x% parameter, for example: powercfg -size 20%
Windows 8 Sleep Mode
Windows 8 Sleep and ARM
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Sleep and Hibernate settings will never be 100% reliable. I can report that my experience of the same Sony VAIO laptop was as follows: with Windows 8 it's a pleasure to use Sleep, even Remote Desktop kicks-in straightaway. Whereas with Vista it was a lottery whether it would ever awaken without a hardware reset / reboot. My laptop's Windows 7 experience was somewhat in-between, tolerable, but lacked the slick seamless coming-to-life of Windows 8.
Event Viewer (Windows System Log)
A good place to start in the Event Viewer is with 'Summary of Administrative Events'. Follow-up by looking in the System Log and filtering for 'Kernel-Power' entries. Interesting items would include 'The last sleep transition was unsuccessful', or 'The system is entering sleep'.
Does the Bios Support Sleep Mode?
To check your computer's BIOS interrupt the initial boot phase, the special key
F2 or the delete key, else try the spacebar. If all else fails read the boot screen! Once you have intercepted the
BIOS boot, just examine carefully any options which could enable / disable Sleep.
Idea: See if there any updates for your BIOS. If so a later version may cure your sleep problems.
Stop Your Computer from Entering Sleep Mode
The main reason to monitor your network is to check that your all your servers are available. If there is a network problem you want an interface to show the scope of the problem at a glance.
Even when all servers and routers are available, sooner or later you will be curious to know who, or what, is hogging your precious network's bandwidth. A GUI showing the top 10 users makes interesting reading.
Another reason to monitor network traffic is to learn more about your server's response times and the use of resources. To take the pain out of capturing frames and analysing the raw data, Guy recommends that you download a copy of the SolarWinds free Real-time NetFlow Analyzer.
All manner of software and hardware can trigger Windows 8 to wakeup from Sleep or Hibernate. Thus the first question is the old chestnut: 'Is this insomniac behaviour due to Hardware or Software?'
To troubleshoot the Sleep Mode problem visit the Device Manager
Hardware Example: The Network adapter --> Advanced menu
Plan B) Blame a virus checker.
Try a completely different strategy, investigate what is happening by using Performance monitor, however, this is a black art.
Reverse Problem - Computer Won't Awaken from Sleep
I have an idea to cure computers that sleep, but won't wake up when you press a key.
Forget Standby. Windows 8 replaces XP's Standby with Sleep.
Do remember that you can 'Switch User' this will save the other person's open files. Not really a sleep or hibernate setting, just an idea for a specific circumstance.
Summary of Windows 8 Sleep Mode and Hibernate
Ever since XP it has been a worry to users whether a computer will actually awaken from Hibernate or Sleep. However, with each succeeding Windows version, sleep seems more reliable, and the Windows 8 computers seem to magically to wake-up when you tickle them with the mouse our Enter key.
It has always been the case that power management is more important on a laptop than a desktop, consequently they have more components to configure, for example the battery, and also the lid.
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Microsoft Windows 8 Troubleshooting Topics