This browser is no longer supported.
Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
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.
- I am only using the Skype "Metro" App
In my experience, if you actually use the app (like doing a video call), until you force close the skype process, you will get the USB HCX ... 100% thing.
You can try to see if this is the problem by reboot, do not use the skype app, go to sleep for a while, check the sleepstudy, and then use the skype app, and go to sleep and check the sleepstudy.
-Joon
I have been trying to resolve this for about a month now. I cant nail down what started it. I have had the Surface Pro 3 I7 since its release, and never had this issue, apart from when I used Hyper-V - but using the switch to disable Hyper-v (with reboot) when I wasn't using it resolved it. Now I see the USB HCX.. using 100% and horrible battery drain in connected stand-by. Its driving me nuts!
Some interesting points for you guys:
Taking on the information I have read here though, I am thinking its got something to do with apps that are using the camera / sound - so i am going to go through those next..
In my case, the "USB xHCI Compliant Host Controller (\_SB.PCI0.XHC)" error is caused by the Kensington Trackball driver software " TrackballWorks 1.2". After uninstall the software, the error disappears. however, this means I cannot use the Kensington Trackball on SP3.=_=
Are you referring to the Skype App or the Skype Desktop application?
Skype Desktop. I removed the app.
Are you referring to the Skype App or the Skype Desktop application?
