NFC seems to get stuck and prevent deep sleep mode (battery drain)

Speewack

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Oct 6, 2011
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I've not yet found the pattern, but I regularly see a significant spike in battery drain on my sg4 when idle.
I've been running Better Battery Stats to try to identify the culprit. I found the following kernel wakelock which seems to keep the CPU from going into deep sleep mode.

"bcm2079x_wake_lock_2nd" (): 4 h 59 m 25 s (17965 s) Cnt:(c/wc/ec)0/0/0 98.9%

The BCM2079x as far as I can tell is the NFC chip used in the device.

I use the Samsung TecTiles (version 2 for the sg4) with my car dock to activate and deactivate car dock mode on the phone.

It appears that sometimes the driver or other software for NFC gets stuck and keeps the phone from sleeping.

Has anyone else had this problem? Any suggestions on how I can run down the root cause and fix the issue?
 

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