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Windows 10 Preview on Surface Pro 3

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Check Power Options> Change Plan> Change Advanced> Sleep> Hibernate after?
Nope.
The closest I have to what you describe is this:
upload_2015-7-2_4-56-25.png

No hibernate option anywhere.
 
According to the insider forum, there are different keys for different versions. Here are keys that should work for build 10158 and 10159:

• Core: KTNPV-KTRK4-3RRR8-39X6W-W44T3
• Pro: 8N67H-M3CY9-QT7C4-2TR7M-TXYCV
• Enterprise: CKFK9-QNGF2-D34FM-99QX2-8XC4K
 
Check Power Options> Change Plan> Change Advanced> Sleep> Hibernate after?
Neither do i have this option, but that was to be expected! Booting from a .vhdx doesnt allow Hibernation.

power options.png



Nope.
The closest I have to what you describe is this:
View attachment 6360
No hibernate option anywhere.

This is mine. Can't imagine why they're different...

View attachment 6361

can you guys try a cmd> powercfg -a ?

Code:
Microsoft Windows [Version 10.0.10159]
(c) 2015 Microsoft Corporation. All rights reserved.

C:\Users\Haldi>powercfg -a
The following sleep states are available on this system:
    Standby (S0 Low Power Idle) Network Connected

The following sleep states are not available on this system:
    Standby (S1)
        The system firmware does not support this standby state.
        This standby state is disabled when S0 low power idle is supported.

    Standby (S2)
        The system firmware does not support this standby state.
        This standby state is disabled when S0 low power idle is supported.

    Standby (S3)
        The system firmware does not support this standby state.
        This standby state is disabled when S0 low power idle is supported.

    Hibernate
        An internal system component has disabled hibernation.
                Boot from VHD

    Hybrid Sleep
        Standby (S3) is not available.
        Hibernation is not available.
        The hypervisor does not support this standby state.

    Fast Startup
        Hibernation is not available.


Uhh... the /Sleepstudy in PowerCFG doesn't work well...

Code:
Microsoft Windows [Version 10.0.10159]
(c) 2015 Microsoft Corporation. All rights reserved.

C:\Windows\system32>set DD=%DATE:~0,2%

C:\Windows\system32>set MM=%DATE:~3,2%

C:\Windows\system32>set YY=%DATE:~8,2%

C:\Windows\system32>set YYYY=%DATE:~6,4%

C:\Windows\system32>set HH=%TIME:~0,2%

C:\Windows\system32>set MN=%TIME:~3,2%

C:\Windows\system32>powercfg /sleepstudy /output "C:\Users\Haldi\Desktop\Battery Log\sleep_report_%YYYY%.%MM%.%DD%-%HH%%MN%.html" /duration 4
No connected standby trace files exist. Put the machine to sleep for several minutes, then try again.

My tablet has not been in Connected Standby for 4 days? i've installed 159 2 days ago... okay... but i've never once missed the power button when putting my tablet away?... that's unrealistic ^^
 
I do believe that the Hibernation Setting is exposing the hybrid power management of the Surface Pro 3 and Surface 3, the Power Management Firmware hibernates the machine in 240 minutes (i.e. 4 hours) after entering Connected Standby.

Windows 10 has a completely new Power Management Subsystem, the latest round of Firmware Updates make the in market Surfaces Compatible with Windows 10 Power Management.

According to my Sleep Study performed this morning, Spartan and the Shell are the two applications/processes that are draining the battery on S0iX.
 
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