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[Guide] Windows 8.1 Sleep not working


I installed Windows 8.1 (fresh install) but it refuses to to sleep/shut down. This has been started happening since I installed 8.1 in Dell XPS 12. It was working fine on my Windows 7 and on Windows 8.0 as well.
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To resolve Windows 8.1 sleep issue try below workarounds,

1.  Check Power Management Options

First step is to check your power options & make sure Sleep option is selected.
Open power options from Control Panel. Click on Change plan Settings.
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Click on Change advanced power settings.
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Under Power buttons and lid and then click the +  and verify the action is really set to Sleep as shown below and Apply the settings.
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2. Disable IPv6 options 

By default all network adapters have both IPv4 and IPv6 versions enabled but you can disable IPv6  as shown below.
Go to Control Panel and open Network and Sharing Center. Click on Change adapter settings as shown below.

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Right click your Ethernet adapter and click Properties  as shown below,
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Uncheck Internet Protocol Version 6 (TCP/IPv6) option as shown below and apply the settings.
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3.  Leave HomeGroup

Open the Control Panel and click on the HomeGroup icon.
On the bottom Click on the Leave the Homegroup link and click on Finnish to leave the HomeGroup.