Upgrading to latest drivers from Nvidia and Intel websites didn't fix problem. Upgrading to latest Nvidia Optimus driver package from Lenovo and disabling Intel graphics solved problem at cost of battery life due Nvidia being always active.
Get latest driver from here: http://support.lenovo.com/fi/en/downloads/ds037642
And follow instructions on this thread to turn off Intel graphics and always use Nvidia only: https://forums.lenovo.com/t5/ThinkPad-P-and-W-Series-Mobile/W540-Disabling-Optimus-in-BIOS-UEFI-gone/td-p/1463401
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