Lenovo B50 with W10.
After a recent upgrade (a forced windows upgrade) this problem began. Not a W10 install but a periodic Windows upgrade. Prior to the upgrade there were no issues.

I have dual monitors and the #2 monitor takes 5+ minutes to wake up. It does this both from either a boot up or from a sleep wake up. Just a blank (dark) screen. Once it decides to wake up everything works normally.
Is there a setting somewhere to 'fix' this?