@RehabMan:
Since the insanelymac domain seems to be down and i can't PM you i'lll just reply here.
It seems that screen saver prefs doesn't respect my settings. I changed the screen saver time from never to 1 min and it did not activate after 1 min. I had to reboot to actually register that setting.
Coming to the point, the screen saver doesn't seem to affect the display problem. Simply stated, the screensaver works as usual and no graphics glitch whatsoever occurred.
I do however noticed some missing sharpness (or you can say 16-bit gradient barely visible) in my login screen. It's always there. But i can notice it in login screen only.
EDIT: Its also visible in launchpad. Barely but it is present.