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Jan.Bartos
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Latitude 5285 battery drain in Modern Standby

Hello community,
my device (Dell Latitude 5285) in Modern Standby mode (S0i3) drains 2% (and sometimes even more) of battery per hour (>650mW), which is significantly more than Modern Standby compliant device should consume. System Power Report identifies "SoC Subsystem" > NoHwDrips.C10 > NoHwDrips.PMC_XHCI_ACTIVITY as root cause of excessive power consumption. Does anybody experienced similar behavior? What is usual battery consumption of your notebook when in Modern Standby (as reported by powercfg /sleepstudy)?

I have Windows 10 Pro version 1809 (OS Build 17763.1), most up-to-date drivers for all hardware. Please do not provide generic information on Power Plans, I already tried to tweak as much as possible (Fast Startup disabled, Always disconnect from network when computer is asleep and on battery power).

2 Replies

Re: Latitude 5285 battery drain in Modern Standby

Per the Microsoft Website, the battery should only drain by 5% of its mWh or mAh capacity over 16 hours.

Try disconnecting devices from USB / TBT, they could be preventing the SOC from going into C10.

I am curious if Dell support can help or do they tell you it is a SW issue and send you to Microsoft ?

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Re: Latitude 5285 battery drain in Modern Standby

my sleep study report.JPG

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