I had posted here already about having the same flickering problem that others with ATI based video cards are having, but I have a little more information now, that may give someone smarter than me a clue as to what's going on. I'm using a Radeon HD6670 card, and have been using it with dual monitors since day one with no problems until this update. I discovered yesterday that if one of my monitors was disconnected, the flickering went away! I also noticed that with both monitors connected, under System Information/Hardware/Graphics/Displays both monitors showed they were using 30 bit color; with only one monitor connected, it showed 32 bit color, just as it should. After seeing the post about SwitchResX, I downloaded it and gave it a try. Sure enough, after setting each monitor to millions instead of billions of colors, no more flickering....and System Information is showing 32 bit color for both monitors. Just to add to the insanity, I tried an old NVidia GT440 card I had laying around---black screen, both monitors, no matter what. I tried both the native drivers and the web drivers, nothing worked. Anyone got ay ideas, comments or suggestions?
