07-01-2016 03:22 PM
My X1 Carbon (model 20A7, 2nd generation I believe) suddenly stopped detecting closure of the lid. Previously, when I close the lid, it would put the laptop into Sleep but now it just continues running. I checked the Control Panels setting and it is still setup to go into Sleep when lid closure is detected so it seems it is smply not detecting it.
In addition, I often work with this machine docked and previously when it was docked, it would not use the attached LCD screen but would only display on the two monitors I have attched to the Lenovo docking station. Now, when I power up hte laptop on the docking station, it displays one monitor on the laptop LCD even though the lid is closed and only on one of the monitors attached to the docking station. I fix this by going into the Control Panel -> Display where I know see three monitors (two external and once LCD on the laptop) and I can disable it from there, but I shouldn't have to do this everytime I dock.
I don't see any mechanical switches to detect lid closure so it must be a magnetic detetion. Any ideas on how to diagnose this?
07-02-2016 02:06 PM
Do you have warranty remaining? I don't have one here with me to try as I am out of town. There is a magnet in the palmrest that triggers a Hall sensor in the lid. My guess is that the sensor has failed, but it is impossible for me to be sure without seeing it.