11-17-2017 09:45 AM
There is a battery draining bug in the latest (184.108.40.206) synaptics drivers. This is true in both the Windows 10 and Windows 7 drivers.
One of synaptics processes is pooling the WMI quite frequently using about 1% of the cpu, non-stop.
This has been fixed in the windows 10 drivers on the Yoga.
There is a detailed writeup on this here:
Reverting back to the 220.127.116.11 drivers fixes this, although they were quite hard to find for Windows 7.
Lenovo, please fix this.