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Some Toshiba laptops require customised drivers.
If the current version 18.104.22.16824 is the generic one from Intel then download build 4703 as ZIP version from Download Intel® Graphics Driver for Windows* [15.40]
Install the new driver via "have disk method" as described at:
(ignore prolog about MS surface)
Maybe you need to update your GeForce driver as well, latest version is 385.28
Many thanks Stefan. It works now. The "have disk" installation method has updated the driver.