Hi Everyone,
TL;DR
C930 does not sleep when closing lid. Instead Tablet Mode is activated when lid is open <=30 degrees. Default Power settings (sleep when lid closed), Yoga Mode Control is installed (latest version), behaviour persists after resetting windows (tried closing lid in setup screen itself without touching anything).
I have recently purchased and received a Yoga C930 13lKB 81C4 directly from Lenovo. After setting up the device, I used it as a laptop for several days. The lid when closed put the computer to sleep, as expected. Afterwards, the wifi card in my c930 fails to connect to the network every time the computer wakes from sleep (common issue, installing latest drivers seems to fix issue). I then installed drivers for Wifi, Bluetooth, BIOS updates (refused to install since I was already on the latest BIOS version) and the Intel Management Engine Firmware (I thought this was for the Spectre/Meltdown problem, turns out it wasn't). Wifi and Bluetooth installed without problems, same with Firmware driver (although the BIOS seemed to "crash" and restart, then windows loaded normally). At around the same time, I decided to use the tablet mode on the c930. After this moment, closing the lid does not put the computer to sleep. Lenovo Vantage and Windows update had no new drivers, resetting all power options had no effect. Having the computer in tablet mode is problematic as this mode is also initiated when connecting to external monitors and closing the lid, as the computer "thinks" it has been rotated 360 degrees, hence crippling the computer when it should behave as a normal laptop. I then reset windows without keeping any personal files with no effect.
I suspect there are several reasons for this behaviour:
-Broken Yoga Mode Control driver for handling the behaviour of the lid
-Installing the Intel Management Engine Firmware 11.8 somehow broke the ACPI Lid driver? (not sure if it was a good idea to install this firmware, or if it was necessary)
-Corrupt OS install
-Worst case scenario: Hinge is defective and needs to be exchanged (although I have never seen this in reviews)
If anyone has similar issues/experiences with their Yoga computers, any suggestions would be appreciated. I was excited to use this machine as my first laptop computer, however this issue could be a premature sign of hinge failiure, which does not instill confidence about the durability of this device, as I plan to use it as an iPad pdf reading replacement and a windows laptop.
Thanks