Kevin,
Just FYI, downloading that older driver and reinstalling it onto the W540 machine, just as described by the user in that Lenovo support forum post, absolutely fixes the issue.
https://forums.lenovo.com/t5/W-Series-ThinkPad-Laptops/W540-won-t-wake-up/td-p/1709441
So this is DEFINITELY a bug in the Intel video driver and the chipset being used with Lenovo's ThinkPad W540 workstation style laptops, running Windows 8.1 Professional.
Someone at Intel needs to give this issue to QA, because this is absolutely a reproduceable bug.