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    <p>I suspect you can do this using API calls to powrprof.dll, as well as WMI, but I haven't had the time to figure that approach out.</p> <p>This setting appears to be simply a boolean registry key that is located according to your current power plan:</p> <blockquote> <p>HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\User\PowerSchemes\(Current Power Scheme GUID)\(Sleep Category GUID)\(Enable AC or DC Wake Timers GUID) = 0 or 1</p> </blockquote> <p>Rather than manipulating the registry directly a cleaner approach would be to enable these settings using powercfg.exe.</p> <p>For AC power:</p> <p><code>powercfg.exe -SETACVALUEINDEX SCHEME_CURRENT SUB_SLEEP bd3b718a-0680-4d9d-8ab2-e1d2b4ac806d 1</code></p> <p>For Batteries:</p> <p><code>powercfg.exe -SETDCVALUEINDEX SCHEME_CURRENT SUB_SLEEP bd3b718a-0680-4d9d-8ab2-e1d2b4ac806d 1</code></p> <p>EDIT:</p> <p>This enables wake timers on my system when running on AC power using High Performance power scheme (purely as a proof of concept):</p> <pre><code>[DllImport("powrprof.dll", EntryPoint = "PowerWriteACValueIndex", CharSet = CharSet.Auto, SetLastError = true)] public static extern uint PowerWriteACValueIndex(IntPtr RootPowerKey, ref Guid SchemeGuid, ref Guid SubGroupOfPowerSettingsGuid, ref Guid PowerSettingGuid, uint AcValueIndex); public static void EnableWakeTimers() { Guid Root = new Guid("8c5e7fda-e8bf-4a96-9a85-a6e23a8c635c"); // High Performance GUID Guid Sleep = new Guid("238c9fa8-0aad-41ed-83f4-97be242c8f20"); // Sleep Subcategory GUID Guid WakeTimers = new Guid("bd3b718a-0680-4d9d-8ab2-e1d2b4ac806d"); // Wake Timers GUID PowerWriteACValueIndex(IntPtr.Zero, ref Root, ref Sleep, ref WakeTimers, 1); } </code></pre> <p>This reference is your friend: <a href="http://msdn.microsoft.com/en-us/library/aa373163%28v=vs.85%29.aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/aa373163%28v=vs.85%29.aspx</a></p>
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    1. POAllow wake timers Windows 7/Vista
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    1. COThanks for respond. I'll check it :)
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