I read this in a other forum and help at the moment.
I found nvavp is used by NVIDIA's Widevine DRM proprietary plugins.
I removed all proprietary DRM plugins from /system/vendor/lib.
Then, the idle battary life becomes normal.
I supposed these thingy are used by Google Play Video/Music, that why some people think disable Google Play Services helps. Althogh I guess it is a bug in NVIDIA's proprietary DRM plugins causes this issue.
I never used Widevine DRM stuff, deleting those files seems to have no drawback for me.
I think only this file make trouble :libwvdrmengine.so
if delete no nvavp problem.
now replace file from here and test again.
android-src-vendor_7-0ubuntu1_all.deb Ubuntu 14.10 Download