Friday, December 26, 2014

Laptop Battery Drain while in Sleep Mode (BlueTooth Mouse)

A bluetooth mouse (even when disconnected, but just because it is configured) can wake a PC from sleep mode causing battery drainage.

Issue the following CLI commands for diagnostics and resolution:

powercfg -devicequery wake_armed
   (find the device name that will wake the system) 
powercfg -devicedisablewake "complete devicename above"

This should return the sleep mode to a nice long battery life.

Here's the background about how I discovered this.

My laptop is a Lenovo x230 that I am very happy with.  Typical Battery life is about 6 hours of casual use.  In Sleep mode it will typically go days without recharge.

Recently I began noticing that it wouldn't make it overnight in sleep mode without draining the battery.  It would be fully charged at 10pm when I put it to sleep and at 7:30am I'd open it up and find it at 6% and in hibernate mode.

A little searching I came across an forum post somewhere and the author described a recent use of a bluetooth mouse and the short battery life began.  It dawned on my that I also had recently used a bluetooth mouse.

Looking a power settings I found the HID mouse was set to wake the computer from sleep mode.  Using the commands above I disabled wake capability for the HID mouse and everything returned to normal.

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