I'm interested to know what other users tend to see when running the "powercfg /sleepstudy" tool on their Surface Pro 3s (as per http://blogs.windows.com/windows/b/windowsexperience/archive/2014/06/26/sleep-study-diagnose-what-s-draining-your-battery-while-the-system-sleeps.aspx ). I'm finding that all my "InstantGo" sessions have a drain rate of between 1200 and 2200mW, which can correspond to between 10% and 20% of the battery drain in the 4 hours before the machine hibernates. Looking at the culprits, almost all the sessions show the following device running for the entire "sleep" period: USB xHCI Compliant Host Controller (\_SB.PCI0.XHC) Fx Device 100% 4:00:00 Is this expected? FWIW, I tend to leave the keyboard cover connected during sleep. Sometimes (when the drain is at the high end of the range), I also see the following: Intel(R) HD Graphics Family (\_SB.PCI0.GFX0) Fx Device 100% 4:00:00 Interestingly, during the first few days I had the SP3, the graphics driver was appearing in every session of the sleep study report. More recently, though, it has stopped appearing. Recently I've been leaving the Surface at the start screen rather than the Desktop, so this may be related - is there a recommendation about coming out of the Desktop before going to "sleep" I also never see anything in the "DRIPS histogram" - should I? What are other people seeing? On a related note, does anyone know if there is a way of changing the time before the machine hibernates? For me, 2 hours (or even 1 hour) would probably be fine - if I'm actively going from one office to another, then the "instant" resume is great, but if I'm at home, leaving the machine for a while, then 4 hours is overkill.

Hi, I updated recently my Surface Pro 3 with windows 10 version 1511. I generated a SleepStudy report and I can notice that no value is specified for the battery design capacity. I would have expected something as it is a Microsoft device. According MSDN, I should see a value as here: https://msdn.microsoft.com/en-us/library/windows/hardware/dn495347%28v=vs.85%29.aspx But I have: Design Capacity mWh Is it normal for the Surface Device? Regards,

I have had a SP3 for about six weeks. SP3 will at times draw about 1% or less per an hour while in connected sleep, but will also draw 20%. When it does this, it will be because the CPU is active for the majority of the time that it is in sleep, yet there will be no activators and no issues in Fx, PDC or networking (all green). CPU will show active time of 95% or more. I have removed all background activity, and have uninstalled programs to see what the issue might be. What is most perplexing is that in the same session, with the same programs running, I will put the computer to sleep and it will do fine. But, if I put the computer to sleep again just minutes later, it may draw 20%. Thus, it does not seem to be based on one program running. I cannot find out what is activating the CPU during sleep and sleepstudy shows no activators. I have had re-installed the Windows, and I have gotten a warranty replacement but the problem persists. Any ideas?

What should "sleepstudy" show for a Surface Pro 3

Anonymous

I'm interested to know what other users tend to see when running the "powercfg /sleepstudy" tool on their Surface Pro 3s (as per http://blogs.windows.com/windows/b/windowsexperience/archive/2014/06/26/sleep-study-diagnose-what-s-draining-your-battery-while-the-system-sleeps.aspx).

I'm finding that all my "InstantGo" sessions have a drain rate of between 1200 and 2200mW, which can correspond to between 10% and 20% of the battery drain in the 4 hours before the machine hibernates.

Looking at the culprits, almost all the sessions show the following device running for the entire "sleep" period:

USB xHCI Compliant Host Controller (\_SB.PCI0.XHC)	Fx Device	100%	4:00:00

Is this expected? FWIW, I tend to leave the keyboard cover connected during sleep.

Sometimes (when the drain is at the high end of the range), I also see the following:

Intel(R) HD Graphics Family (\_SB.PCI0.GFX0)	Fx Device	100%	4:00:00

Interestingly, during the first few days I had the SP3, the graphics driver was appearing in every session of the sleep study report. More recently, though, it has stopped appearing. Recently I've been leaving the Surface at the start screen rather than the Desktop, so this may be related - is there a recommendation about coming out of the Desktop before going to "sleep"

I also never see anything in the "DRIPS histogram" - should I?

What are other people seeing?

On a related note, does anyone know if there is a way of changing the time before the machine hibernates? For me, 2 hours (or even 1 hour) would probably be fine - if I'm actively going from one office to another, then the "instant" resume is great, but if I'm at home, leaving the machine for a while, then 4 hours is overkill.

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Anonymous

2015-11-17T15:56:22+00:00

Hi,

I updated recently my Surface Pro 3 with windows 10 version 1511.

I generated a SleepStudy report and I can notice that no value is specified for the battery design capacity. I would have expected something as it is a Microsoft device.

According MSDN, I should see a value as here:

https://msdn.microsoft.com/en-us/library/windows/hardware/dn495347%28v=vs.85%29.aspx

But I have:

Design Capacity mWh

Is it normal for the Surface Device?

Regards,
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Anonymous

2015-06-12T13:45:57+00:00

I have had a SP3 for about six weeks.

SP3 will at times draw about 1% or less per an hour while in connected sleep, but will also draw 20%. When it does this, it will be because the CPU is active for the majority of the time that it is in sleep, yet there will be no activators and no issues in Fx, PDC or networking (all green). CPU will show active time of 95% or more. I have removed all background activity, and have uninstalled programs to see what the issue might be. What is most perplexing is that in the same session, with the same programs running, I will put the computer to sleep and it will do fine. But, if I put the computer to sleep again just minutes later, it may draw 20%. Thus, it does not seem to be based on one program running. I cannot find out what is activating the CPU during sleep and sleepstudy shows no activators.

I have had re-installed the Windows, and I have gotten a warranty replacement but the problem persists.

Any ideas?
Was this answer helpful?

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