My T540p turns off an AC to work on drums and never returns back

Since the last device of management power Lenovo update (somewhere 6-13 Oct 2015), my T540p jumps out of his power and never returns back, until I have turn it off and disconnect the battery.

When I start Windows 10 after the battery is disconnected, it loads for a few minutes and then to the battery. Whatever I do after that - Plug and unplug the power adapter, change to another adapter (I have a spare), extinction, reboot, poweroff connect AC - nothing works. When I disconnect the battery and plug back - normal behavior is restored.

I have dual boot on my T540p with linux (Gentoo, kernel 4.2.3). Linux works OK. The problem appears only when I boot Windows 10.

It turned out that Windows has jumped to a special power - autonomous mode. Once I turn it back into balance, the battery took over. I couldn't understand what Windows switch to the mode of independent power supply.

It's very sad that CE supports standalone through reboots and poweroffs. It is not logical to disable the battery charge when the machine is turned off completely.

Tags: ThinkPad Notebooks

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