Y410P screen flickering and entering sleep

After leaving my Y410P idle for several hours, typically after going to sleep, or going out for a long time, I will return to it and find that it has gone into sleep mode. However, under Windows power options, I have all plans set to never put my computer to sleep.

Also, my screen continues to be plagued with insidious flickering, both on the desktop and while gaming, where it simply flashes black multiple an average of once per second, though sometimes as much as 3 times in a second. This typically only happens after it has been running for a while. Restarting the computer puts it at bay, but it does eventually come back. However, one area that does consistently have flickering is the Windows user login screen.