<p><a href="http://wincert.net/wp-content/uploads/2015/01/windows8-2.jpg"><img class="alignnone size-full wp-image-549" src="http://wincert.net/wp-content/uploads/2015/01/windows8-2.jpg" alt="Windows 8 Box,delete fonts,start screen,sleep" width="720" height="340" /></a></p>
<p>I have noticed that my Windows 8 system won&#8217;t go to sleep automatically even though the sleep function was working normally with Windows 7.</p>
<p>I am using Asus P8Z77-V LE Plus with Intel i5 3450 CPU on Ivy Bridge with the latest version of MBO BIOS that has improved compatibility with Windows 8.</p>
<p><strong>powercfg /a</strong> command gave the result that Standby (S3) is available on my system.</p>
<p>Standby (S3) is the new standard that Windows 8 uses, unlike Windows 7 that used (S1) and (S2).</p>
<p>To use the (S3) Sleep feature you have to enable <strong>Hybrid Sleep</strong> in power options as in the picture below (should be enabled by default):</p>
<p><img class=" size-full wp-image-373" src="http://wincert.net/wp-content/uploads/2012/09/hybrid_sleep.PNG" alt="" width="418" height="449" border="0" /></p>
<p>When I tried to enter the sleep manually <strong>Win+I | Power | Sleep</strong> it worked. The machine is capable of sleep but it just won&#8217;t go there.</p>
<p>Therefore it was time for <strong>powercfg /energy</strong> command that gives you Power Efficiency Diagnostics Report in the following location:</p>
<p><strong>C:\Windows\System32\energy-report.html</strong></p>
<p>You won&#8217;t be able to open the report in the stated location because of the permission issues. This could be a Windows 8 bug, so you&#8217;ll just have to copy it to some other location like the Desktop.</p>
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<p>Among other things I have noticed that first in the line was Windows Media Player Network Service that prevented the system going into sleep mode.</p>
<p><strong>The program has made a request to prevent the system from automatically entering sleep.</strong></p>
<p><strong>Requesting Process \Device\HarddiskVolume4\Program Files\Windows Media Player\wmpnetwk.exe </strong></p>
<p>Therefore I stopped and disabled Windows Media Player Network service because I actually don&#8217;t use it. After the restart and 30 minutes of inactivity, my system wen&#8217;t to sleep automatically.</p>
<p><img class=" size-full wp-image-374" src="http://wincert.net/wp-content/uploads/2012/09/windows media player network service.PNG" alt="" width="633" height="62" border="0" /></p>
<p>I have also noticed couple of error entries in the Event Viewer. It is interesting that all these entries were related to manual sleep requests. I haven&#8217;t received this error code when the system entered sleep automatically.</p>
<p>Here&#8217;s what the log says:</p>
<p><strong>The system firmware has changed the processor&#8217;s memory type range registers (MTRRs) across a sleep state transition (S4). This can result in reduced resume performance.</strong></p>