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?

Ahh yes, VirtualBox. This wasn't installed when I started this thread (so isn't the root cause of my initial problems) but I have noticed that when I did install Virtual Box, it absolutely killed my battery - it was so power hungry, it even seemed to stop the SP3 from charging successfully when docked (it could take many hours before it would get back to 100%). I've uninstalled it, but if I need it again, I'll try your recommended settings to see if that helps. [My worry is that in the scenario I had, I actually needed two Virtual Box VMs to talk to each other, so I suspect I may have needed the host-only and bridged adapters.]

Looks like I solved high battery drain in sleep on my Surface Pro 3. It started when I installed VirtualBox. I didn't know that issue with high battery drain was there a lot more time, since VirtualBox installation. :) So solution in my case is: Control Pannel -> Network and Internet -> Network and Sharing Center -> Change adapter settings -> 1) Disable VirtualBox Host-Only Network (wired connection) and 2) Right click and choose Properties on Marvell AVASTAR Wireless-AC Network Controller and untick VirtualBox Bridged Network Driver . (I am using Windows in my locale language, so I hope all "translations" are understandable.) Guest OS in VirtualBox is still able to use wireless connection in my case, but there is no more high battery drain in sleep. :))

I know we use the GPOs to enforce screen savers, but I'm not sure we use them to control the other power management settings. I'll ask and see if I can get one of our IT guys to weigh in on this thread.

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?
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Anonymous

2015-05-19T08:19:12+00:00

Ahh yes, VirtualBox. This wasn't installed when I started this thread (so isn't the root cause of my initial problems) but I have noticed that when I did install Virtual Box, it absolutely killed my battery - it was so power hungry, it even seemed to stop the SP3 from charging successfully when docked (it could take many hours before it would get back to 100%).

I've uninstalled it, but if I need it again, I'll try your recommended settings to see if that helps. [My worry is that in the scenario I had, I actually needed two Virtual Box VMs to talk to each other, so I suspect I may have needed the host-only and bridged adapters.]
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Anonymous

2015-05-19T07:46:00+00:00

Looks like I solved high battery drain in sleep on my Surface Pro 3. It started when I installed VirtualBox. I didn't know that issue with high battery drain was there a lot more time, since VirtualBox installation. :)

So solution in my case is: Control Pannel -> Network and Internet-> Network and Sharing Center -> Change adapter settings -> 1) Disable VirtualBox Host-Only Network (wired connection) and 2) Right click and choose Properties on Marvell AVASTAR Wireless-AC Network Controller and untick VirtualBox Bridged Network Driver. (I am using Windows in my locale language, so I hope all "translations" are understandable.) Guest OS in VirtualBox is still able to use wireless connection in my case, but there is no more high battery drain in sleep. :))
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Anonymous

2015-05-15T17:52:46+00:00

I know we use the GPOs to enforce screen savers, but I'm not sure we use them to control the other power management settings.

I'll ask and see if I can get one of our IT guys to weigh in on this thread.
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