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 ran a sleepstudy on my Pro 3 (i5/4Gb/128Gb) - it also has a SD card installed and a HP bluetooth mouse (HP X4000b) ... and I noticed that in many of the sessions (not all) it was showing that the USB xhci was active for 100% of the sleep period. I tried a couple of things - Disabled bluetooth - problem disappeared Removed my phone from the bluetooth paired devices - problem disappeared. What I find as totally incomprehensible (and not useful at all) about the sleepstudy report is that it DOES NOT IDENTIFY AT ALL what is causing the issue. Not really that good is it? ...

I agree with you. There are so many things that may activate this USB controller. In my case it was a faulty Citrix Receiver. If I had not systematically saved restore points before each new software installation and run sleepstudy everytime after, I couldn't have guessed it was Citrix. They should improve this report to tell you what's activating the USB controller.

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.

Locked Question. This question was migrated from the Microsoft Support Community. You can vote on whether it's helpful, but you can't add comments or replies or follow the question.

0 comments

82 answers

Anonymous

2015-03-02T10:49:00+00:00

Hi,

I ran a sleepstudy on my Pro 3 (i5/4Gb/128Gb) - it also has a SD card installed and a HP bluetooth mouse (HP X4000b) ... and I noticed that in many of the sessions (not all) it was showing that the USB xhci was active for 100% of the sleep period. I tried a couple of things -

Disabled bluetooth - problem disappeared

Removed my phone from the bluetooth paired devices - problem disappeared.

What I find as totally incomprehensible (and not useful at all) about the sleepstudy report is that it DOES NOT IDENTIFY AT ALL what is causing the issue. Not really that good is it? ...
Was this answer helpful?

0 comments No comments
Anonymous

2015-03-03T02:05:09+00:00

I agree with you. There are so many things that may activate this USB controller. In my case it was a faulty Citrix Receiver. If I had not systematically saved restore points before each new software installation and run sleepstudy everytime after, I couldn't have guessed it was Citrix. They should improve this report to tell you what's activating the USB controller.
Was this answer helpful?

0 comments No comments
Anonymous

2015-03-03T08:15:19+00:00

+1000000 on that! :)
Was this answer helpful?

0 comments No comments

Anonymous

My SP3 doesn't go into Hibernate anymore. Most of the time I keep it in the dock, but when it is not, it is draining the battery, and the culprit is the "Wireless-AC Network Controller" and "Connection Phase" is active 100% of the time...this even happens after a night where I put the SP3 into Airplane mode!!! Anybody know how to fix this problem?

16	2015-03-24 22:07:20	8:39:50	10,576 mWh	25% of battery	1,221 mW	Drain	22%	HW: 0%

Top Offenders

Top 5 offenders, ranked by active time

Marvell AVASTAR Wireless-AC Network Controller	Networking	100%	8:39:45
Connection Phase	PDC Phase	100%	8:39:44
Disk drive (\_SB.PCI0.SAT0.PRT0)	Fx Device	18%	1:32:20
Intel(R) HD Graphics Family (\_SB.PCI0.GFX0)	Fx Device	0%	0:00:09
USB xHCI Compliant Host Controller (\_SB.PCI0.XHC)	Fx Device	0%	0:00:07

0 comments

Anonymous

Definitely something is preventing your SP3 in going into connected standby mode. I think the real culprit is the Connection Phase (PDC Phase) which seems to be stuck in restart/resume mode and that's what keep the wifi activated constantly.

I don't know enough about this process, but googling "connection phase - pdc phase" gives a number of hits on issues related to that, may be worth looking at in more detail.

The best way I have found to resolve connected standby issues is to revert to previous system configurations (when you knew for a fact that connected standby was working correctly) because most, if not all, of these issues are due to recent program installations and system changes. It is apparent that some software manufacturers are not careful enough in testing that their software isn't interfering with connected standby.

So try to uninstall any software you have recently installed. Also, look in Recovery, System Restore, and see if you can revert to a previous restore save point. Make sure you backup your documents, pictures, videos and stuff before doing so - system restore is not supposed to do anything to documents, but better be safe than sorry.

Let us know what you find out or not, can be useful to other out there!

My SP3 doesn't go into Hibernate anymore. Most of the time I keep it in the dock, but when it is not, it is draining the battery, and the culprit is the "Wireless-AC Network Controller" and "Connection Phase" is active 100% of the time...this even happens after a night where I put the SP3 into Airplane mode!!! Anybody know how to fix this problem?

16 2015-03-24 22:07:20 8:39:50 10,576 mWh 25% of battery 1,221 mW Drain 22% HW: 0%

Top Offenders

Top 5 offenders, ranked by active time

Marvell AVASTAR Wireless-AC Network Controller Networking 100% 8:39:45

Connection Phase PDC Phase 100% 8:39:44

Disk drive (\_SB.PCI0.SAT0.PRT0) Fx Device 18% 1:32:20

Intel(R) HD Graphics Family (\_SB.PCI0.GFX0) Fx Device 0% 0:00:09

USB xHCI Compliant Host Controller (\_SB.PCI0.XHC) Fx Device 0% 0:00:07

0 comments