Touchpad disables when on battery

Hello,
on Lenovo ideapad 100S-11IBY after last Windows update my touchpad gets disabled when laptop is on battery, when it's plugged in and charging everything works well. I can enable touchpad with shortcut on F6 key, but after few seconds of not using the touchpad, it disables by itself. I also noticed that I can enable touchpad by clicking the physical left or right click below it, but not by tapping the touchpad. Also, I think it has something to do with Power Management, but when I go to Manage->Device Manager->Mice and pointing devices->HID-compliant mouse and go to Properties, I don't have the Power Management tab there. Drivers are up to date, and there are no mouse drivers on Lenovo support page.

I ran out off ideas, any help is appreciated. Thank you in advance.
 

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Last updated August 21, 2019 Views 3,713 Applies to:
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Answer
I think I finally found a workaround that works with my computers that was impacted by this bug. I found it on the Lenovo forum, on another thread (https://forums.lenovo.com/t5/forums/v3_1/forumtopicpage/board-id/EN-win10/thread-id/5560/page/3). The described method is specific to the Lenovo model but it can be easily adapted to others computers too. Here is what I've done:

1) Run regedit as administrator
2) Browse to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\
3) Search for EnhancedPowerManagementEnabled
4) Change the EnhancedPowerManagementEnabled DWORD value from 1 to 0 (make a .reg export as a backup before if you want)
5) Search again and repeat, until you find a key outside the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\ key
6) Reboot

And voilà, my touchscreen and touchpad works well, even after a reboot, shutdown, deepsleep...!

As said in the Lenovo thread, this "patch" should not survive a driver update or a system restore, but at least it can be done again if needed, until Microsoft provides a real fix.

Yann

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