T440s freezes when plugged in to AC after upgrade to Windows 10

After upgrading to Windows 10 my T440s shows the following behaviour: It boots up fine with the AC adapter plugged in. Now if I unplug power it goes into battery mode, i.e. darker backlight etc just fine. Now plugging the power back in, the screen gets brighter but the UI freezes. The screen freezes and the mouse pointer doesn't move. It doesn't seem to completely lock up though because when I unplug the power again everything comes back to life again. I have installed the latest Windows 10 drivers I could find to no avail. Anybody have the same experience?  Thanks, Carsten 

I am happy to report that this is fixed after upgrading the Intel HD Graphics driver from Windows Update via Device Manager. Not sure why that hadn't shown up as available directly in Windows Update. 

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