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08-17-2014

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T540p battery drain in S4 state after Bios and Intel Wifi driver update

2014-08-19, 19:35 PM

Hey Guys,

 

on my T540p, I configured the rapid start technology according to 

 

http://download.intel.com/support/motherboards/desktop/sb/rapid_start_technology_user_guide.pdf

 

Since I have performed a BIOS update to 2.14  and an update of the Intel Wifi driver to 17.0.5, I experience the problem of battery drain when the computer is in S4 sleep state, at a rate of approximately 0.125% per hour (on the 56Wh battery).

 

This was not the case before these updates. There was no noticable power drain in S4 sleep state, even not over multiple days.

 

I'm using Win7, I set all the WoL capabilities both in BIOS and in the Intel driver to disabled, according to 

 

https://forums.lenovo.com/t5/IdeaPad-Y-U-V-Z-and-P-series/Battery-drain-when-powered-down-Y410P/td-p/1201890/page/3

 

External device USB charge settings are also fully disabled in BIOS and Power Manager. The problem does not occur when the system is fully shut down, but in S4 Sleep state, which should be a zero-power state too, as it was before the updates. In the details of the BIOS update it is stated " Fixed an issue where the computer might fail to enter sleep state". Could the power drain be a side effect of this fix? Or is it an issue with the (new) Wifi driver, as it was the case for the Y410P?

 

How could this battery drain be avoided? Has anybody experienced the same issue?


Best,

 

Martin

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106 Posts

01-18-2013

USA

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Re: T540p battery drain in S4 state after Bios and Intel Wifi driver update

2014-08-20, 2:34 AM

Had a similar issue with battery drain in S3 (enough system activity to cause the fan to turn on). After I disabled iAMT (remote management) in the BIOS the problem never returned.

 

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3 Posts

08-17-2014

Germany

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Re: T540p battery drain in S4 state after Bios and Intel Wifi driver update

2014-08-20, 7:50 AM

Thank you for your response. Unfortunately, there is no iAMT option in T540p's BIOS.

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12630 Posts

06-06-2011

RU

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Re: T540p battery drain in S4 state after Bios and Intel Wifi driver update

2014-08-20, 10:26 AM
mka1284,

you could check out devices that might resume laptop from the sleep modes and disable them. Type in the following command in the cmd line window:
powercfg -devicequery wake_armed

Also the following command will show you report about power management. Open cmd window with administrative rights and type in:
powercfg -energy.



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3 Posts

08-17-2014

Germany

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Re: T540p battery drain in S4 state after Bios and Intel Wifi driver update

2014-08-22, 7:34 AM

The BIOS update somehow caused the setting "allow activation by windows timers" in the Power Manager to turn to "activated". These timers were responsible for the power drain. Thank you for your help.

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