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I have a Lenovo ThinkPad t460p whoose keyboard randomly stops working after startup and touchpad scroll also works with delay when keyboard stops working but keypad mouse works just fine, When this problem arrives and i try to restart the laptop or even shut it down, the laptop goes to “Shutting down” screen of windows and after some time screen turns off but the laptop does not shuts down and even if i keep pressing the power button for 20 seconds it does not shuts down unless i have to take out the battery and put it back again… One thing is that all these problems happens only when keyboard stops working and this happens randomly like after 3 hours or after 15 mins like it can take random time to stop working and another thing is that if i put the laptop without any use like for 2 days this issue will come after longer time like 2 3 hours of use but once the issue starts and i reatart the laptop then it keeps coming much faster… One More thing to mention is that the laptop some time gets the blue screen error too saying “Device power state faliure” when this keyboard problem happens… I checked the laptop in a repair shop and they told me that its internal keyboard and trackpad (mouse) has no issues it could be some bios or motherboard issue but hey couldn’t figure it out, and i also installed fresh windows to see if the problem remains but it also didn’t helped…. I would be really grateful for the help…
Sounds like a possible overheating issue as you say it happens after a few hours. Try blowing the dust out through the cooling vents or if you feel up to it open the case for a more thorough clean. Do NOT touch any internal parts unless you know what you are doing. Electro static energy discharge can damage delicate electronic parts. Enter your serial number or click “Detect Product” button to access the Hardware Maintenance Manual here: https://support.lenovo.com/nz/en/solutio…
Try to get an external mouse and keyboard and see if there are any driver updates.
