Dell Venue 11 Pro (7140) Connected Standby Battery Drain

I may add, that for this current setup I used a clean win8.1 installation from a non-dell installation medium, because after a windows reset, the recovery partition was too small. So if there were any registry adjustments to the power plans, I don't have them anymore. But with the stock windows installation, the results were very similar, as also reported by the dell technicians in germany.

One month later and the issue still persists. Also no further reply on this from german customer support. As written in other threads, the tablet should drain around 5%/16h as this is the requirement to have connected standby enabled by default on the device.

Another two months later and still nothing has happened. Why is this issue being ignored? With Windows 10, the situation is even worse as the device does not enter sleep states C8-C10 at all but stays in C7 all the time.

Eventually someone at Microsoft has to make a statement how this device could have passed the logo test for connected standby at all.

I still can't reproduce this issue on my systems.    I'm getting 4-5 days of life.   Is anyone else having this problem to this extreme?   Factory load or did you modify?

I have tested much, but achieved the best results with an installation from my Recovery-Image, which I made from the factory installation. I installed it yesterday to provide current results. All Windows updates were installed but nothing else. In the BIOS I disabled all possible devices (Wifi,WAN,Cameras,USB Port,Media Card,Audio,...).

As you can see, the system resides 99% in the hardware low power state, but there is still a drain of ~9% in 6:30h. If my thoughts are correct, the device should do much much better:

Current capacity of the battery: 34861mW
Drain in standby: 1.38%/h => 482mW
Resulting standby time: 72h = 3 days

I looked up specs, to see how much power should be drawn from several devices in standby:
Processor M-5y10c in C10: 30mW (Intel Specs)
2x2GB DDR3L-RS (did not verify, printed in manual): 2x3mW in Self-Refresh (typical, jedec.org)
Sandisk X110 SSD in DevSlp: 4.8mW (Sandisk Specs)
Graphic hardware / Panel in D3 should powered down completely?
The other devices should have been drawing no power, since they were disabled in BIOS. But even enabling them makes no big difference as I learned from previous tests.

This explains 41mW, which would result in a magnificent 35 days standby .. with a more realistic 105mW this would still be 13 days. So there really is still some space left for Wifi and Services. From the calculation, there are around 440mW missing. So which device draws this much power when it should be deactivated?

From previous study i know that an Intel analyzing tool shows that the processor is in C10 the whole time. (In the upcoming, still unsupported, Windows 10, the processor can only reach C7, which might be another issue). The Windows Performance Analyzer tells me that all devices (even when activated in BIOS) are in D3, except (if I remember correctly) the XHCI USB controller which is in D2. So I am clueless. I guess firmware or devices drivers could both be buggy, providing wrong information.

Yes, I am also having this issue.

My dell battery drains to ZERO overnight.

By running the sleep study tool, I have come up with the conclusion that the Intel 7265 is at fault.

If you find a fix please let me know.

The following thread may contain the solution to your problem, although i'm not sure precisely how to implement it. If anyone succeeds at this, please post a step-by-step procedure.

en.community.dell.com/.../19619012

In the problem you mentioned, the author had 80% network activity .. and the best he could come up with is the same, which I have.

UPDATE:

I have found out, that the latest WIFI driver nearly doubles the standby time under ideal conditions. This is really really strange, because in my tests, Wifi had been _disabled_ in BIOS. So how can a driver improve the situation compared to a completely disabled device? Currently, the tablet uses approximately 0.7% per hour. This is much better. But following the preceding calculation, this is still too much. We might easily double the standby time again. So what else is draining power?

I would love to know what you guys have done to get the CS consumption down to .7% per hour. mine is using about 3% per hour in CS. mine is set up with a local account, and I have only installed office 2013, acrobat, and firefox. This is after a fresh install of 8.1 from dell media, with the latest drivers and bios. I am really starting to miss my old android tablet. I could leave that thing for a week, and it still had a significant amount of power. This thing is down 50%in one day, just sitting there.  I am really considering selling this thing if this doesn't get sorted out soon.

I have exactly the same problem.Although in sleepstudy there is no apparent offender I still have high drain.I really wonder how did this tablet passed the connected standby certification.

I suspect it will have something to do with the bios.

I've managed to get my battery drain down to about 250mW for most of the time. Every now and again it slips to about 2800mW for no apparent reason before going back to 250mW. The SleepStudy doesn't seem to pinpoint anything useful.

I'm running Windows 10 with the latest BIOS and drivers from the Dell support website.

Under System, Power and Sleep, I have got Wi-fi turned off when asleep. I have also enabled Hibernate after 120 minutes to cover the times when the connected standby starts to guzzle the battery.

I had the exact same issue on my 7140. The only solution was to deactivate modern standby and just use hibernate sleep.

3 years later, my brand new XPS 15 9570 has the EXACT SAME ISSUE. How incompetent is Dell even? Does anyone know at Dell what modern standby is? Ask maybe at Microsoft for advice how to properly make their devices work correctly with Windows 10?