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.

I think we're definitely on to something here. I closed down both Skype and my company VoIP phone client last night (both of which have access to USB headset and camera) and, lo and behold, for almost the first time ever I had sleep study show "all green" in terms of activity (no xHCI hub and just a few things active for around 5% of the time). I also had a large bar in the 32s part of the DRIPS graph (which is normally completely blank). What is also interesting is that during this session, I didn't actually lose that much less power than in the previous session where the xHCI device was active - I had a discharge rate of 940mW compared to 1031mW the previous day. I think this tends to tell me that (in my case) - closing these comms devices does help - my device has actually settled down since I started this thread so that even with the xHCI active, I don't lose more than around 10% per 4 hour standby period.

Yes - while it is hard to pin down since usually something else going on (for example, automatic updates), but it definitely looks like it is related to Skype. It is not 100%, but I do feel there are strong correlation between the red items showing up and skype being on.

I think you are on to something, I removed my Skype desktop and Clearsea (lifesize video client) and last night I only lost 14% over a 16 hour sleep last night and 6% over 8 hours the night before. Historically I would lose 40-50% in a 14 hour sleep cycle. I did keep my lync client, as I use that for work, but I'm not seeing any "red" drivers in sleep study anymore. Justin.

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.

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Anonymous

2014-10-08T08:44:24+00:00

I think we're definitely on to something here.

I closed down both Skype and my company VoIP phone client last night (both of which have access to USB headset and camera) and, lo and behold, for almost the first time ever I had sleep study show "all green" in terms of activity (no xHCI hub and just a few things active for around 5% of the time). I also had a large bar in the 32s part of the DRIPS graph (which is normally completely blank).

What is also interesting is that during this session, I didn't actually lose that much less power than in the previous session where the xHCI device was active - I had a discharge rate of 940mW compared to 1031mW the previous day. I think this tends to tell me that (in my case)

- closing these comms devices does help

- my device has actually settled down since I started this thread so that even with the xHCI active, I don't lose more than around 10% per 4 hour standby period.
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Anonymous

Adding the usage chart that shows pre/post Skype/clearsea removal (removal stats starting at row 6)

1 2014-10-04 09:20:49 2:00:05 2,202 mWh 5% of battery 1,101 mW Drain 0% HW: 0%

2 18:41:46 7:00:05 9,107 mWh 22% of battery 1,301 mW Drain 0% HW: 0%

3 2014-10-05 13:37:24 0:39:48 759 mWh 2% of battery 1,147 mW Drain 0% HW: 0%

4 15:18:28 0:48:24 - - - Charge 0% HW: 0%

5 16:08:40 2:11:25 - - - Charge 39% HW: 37%

6 22:31:13 8:20:23 2,559 mWh 6% of battery 307 mW Drain 92% HW: 92%

7 2014-10-06 06:55:15 2:30:11 948 mWh 2% of battery 379 mW Drain 89% HW: 89%

8 09:31:05 0:14:31 288 mWh 1% of battery 1,200 mW Drain 61% HW: 61%

9 10:11:15 1:08:59 561 mWh 1% of battery 489 mW Drain 88% HW: 88%

10 11:21:15 0:55:58 1,595 mWh 4% of battery 1,713 mW Drain 67% HW: 67%

11 13:28:10 3:17:01 1,129 mWh 3% of battery 344 mW Drain 92% HW: 92%

12 16:46:03 16:25:34 5,830 mWh 14% of battery 355 mW Drain 96% HW: 96%

1	2014-10-04<br>09:20:49	2:00:05	2,202 mWh	5% of battery	1,101 mW	Drain	0%	HW: 0%
2	18:41:46	7:00:05	9,107 mWh	22% of battery	1,301 mW	Drain	0%	HW: 0%
3	2014-10-05<br>13:37:24	0:39:48	759 mWh	2% of battery	1,147 mW	Drain	0%	HW: 0%
4	15:18:28	0:48:24	-	-	-	Charge	0%	HW: 0%
5	16:08:40	2:11:25	-	-	-	Charge	39%	HW: 37%
6	22:31:13	8:20:23	2,559 mWh	6% of battery	307 mW	Drain	92%	HW: 92%
7	2014-10-06<br>06:55:15	2:30:11	948 mWh	2% of battery	379 mW	Drain	89%	HW: 89%
8	09:31:05	0:14:31	288 mWh	1% of battery	1,200 mW	Drain	61%	HW: 61%
9	10:11:15	1:08:59	561 mWh	1% of battery	489 mW	Drain	88%	HW: 88%
10	11:21:15	0:55:58	1,595 mWh	4% of battery	1,713 mW	Drain	67%	HW: 67%
11	13:28:10	3:17:01	1,129 mWh	3% of battery	344 mW	Drain	92%	HW: 92%
12	16:46:03	16:25:34	5,830 mWh	14% of battery	355 mW	Drain	96%	HW: 96%

So what I noticed in this sleep study report is that you are probably not running the factory load of Windows 8.1 on the Surface. We don't run the factory load either and we're having battery drain issues as well that I've attributed to Cisco AnyConnect. However what we are also missing in our corporate image is the hibernate after 4 hour setting that's in the factory load. I can tell from your sleep study that you don't have it either because if you did, your longest Connected Sleep sessions would be 4 hours long. Once we implemented that, we went from around a 45-50% battery drain overnight to about 15-18%. Not perfect, but an improvement. To get further improvements, we'll need to get Cisco to address it in their software.

There is a hotfix (KB2955769) you need to install and the registry settings are mentioned earlier in this thread.

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Anonymous

2014-10-07T16:49:18+00:00

Yes - while it is hard to pin down since usually something else going on (for example, automatic updates), but it definitely looks like it is related to Skype. It is not 100%, but I do feel there are strong correlation between the red items showing up and skype being on.
Was this answer helpful?

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Anonymous

Adding the usage chart that shows pre/post Skype/clearsea removal (removal stats starting at row 6)

1 2014-10-04 09:20:49 2:00:05 2,202 mWh 5% of battery 1,101 mW Drain 0% HW: 0%

2 18:41:46 7:00:05 9,107 mWh 22% of battery 1,301 mW Drain 0% HW: 0%

3 2014-10-05 13:37:24 0:39:48 759 mWh 2% of battery 1,147 mW Drain 0% HW: 0%

4 15:18:28 0:48:24 - - - Charge 0% HW: 0%

5 16:08:40 2:11:25 - - - Charge 39% HW: 37%

6 22:31:13 8:20:23 2,559 mWh 6% of battery 307 mW Drain 92% HW: 92%

7 2014-10-06 06:55:15 2:30:11 948 mWh 2% of battery 379 mW Drain 89% HW: 89%

8 09:31:05 0:14:31 288 mWh 1% of battery 1,200 mW Drain 61% HW: 61%

9 10:11:15 1:08:59 561 mWh 1% of battery 489 mW Drain 88% HW: 88%

10 11:21:15 0:55:58 1,595 mWh 4% of battery 1,713 mW Drain 67% HW: 67%

11 13:28:10 3:17:01 1,129 mWh 3% of battery 344 mW Drain 92% HW: 92%

12 16:46:03 16:25:34 5,830 mWh 14% of battery 355 mW Drain 96% HW: 96%

1	2014-10-04<br>09:20:49	2:00:05	2,202 mWh	5% of battery	1,101 mW	Drain	0%	HW: 0%
2	18:41:46	7:00:05	9,107 mWh	22% of battery	1,301 mW	Drain	0%	HW: 0%
3	2014-10-05<br>13:37:24	0:39:48	759 mWh	2% of battery	1,147 mW	Drain	0%	HW: 0%
4	15:18:28	0:48:24	-	-	-	Charge	0%	HW: 0%
5	16:08:40	2:11:25	-	-	-	Charge	39%	HW: 37%
6	22:31:13	8:20:23	2,559 mWh	6% of battery	307 mW	Drain	92%	HW: 92%
7	2014-10-06<br>06:55:15	2:30:11	948 mWh	2% of battery	379 mW	Drain	89%	HW: 89%
8	09:31:05	0:14:31	288 mWh	1% of battery	1,200 mW	Drain	61%	HW: 61%
9	10:11:15	1:08:59	561 mWh	1% of battery	489 mW	Drain	88%	HW: 88%
10	11:21:15	0:55:58	1,595 mWh	4% of battery	1,713 mW	Drain	67%	HW: 67%
11	13:28:10	3:17:01	1,129 mWh	3% of battery	344 mW	Drain	92%	HW: 92%
12	16:46:03	16:25:34	5,830 mWh	14% of battery	355 mW	Drain	96%	HW: 96%

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Anonymous

2014-10-07T16:23:53+00:00

I think you are on to something,

I removed my Skype desktop and Clearsea (lifesize video client) and last night I only lost 14% over a 16 hour sleep last night and 6% over 8 hours the night before.

Historically I would lose 40-50% in a 14 hour sleep cycle.

I did keep my lync client, as I use that for work, but I'm not seeing any "red" drivers in sleep study anymore.

Justin.
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