I decided to take the time to try and find out everything I could about this AMP bug.
It definitely exists, and is easy as pie to reproduce and test.
At first I turned my TV on in PC mode and couldn't replicate the bug. Scrolling through forums and moving the mouse around was as smooth and responsive as it should've been, without any AMP artifacting when I moved the mouse around. However, I renamed HDMI2 to something else, turned my TV off, then back on. Instantly I could tell AMP was on, just by scrolling through these very forums. I enabled game mode and scrolled again - AMP was definitely still on. As a final test, I renamed HDMI2 to PC and scrolled through the forums again - shockingly, amp was still on!
. This means two things - the bug doesn't occur if you start the TV in PC or game mode, otherwise it occurs every time you turn the TV on. You can also disable AMP by going into the menu, turning it on, then back off.
What does this mean for the input lag report I made? The numbers I posted may be inaccurate, as AMP very well may have been on the entire time. This would provide a handy explanation as to why the set seemed so laggy compared to the A650, regardless of cables or configuration. Unfortunately, even if this proves to be the case - this model is nearly a year old and has yet to receive a firmware update to correct the issue. With the '09 models just around the corner, in all likelihood it will never be corrected unless a lot
of people complain to Samsung about it.
I will perform my tests in standard mode over HDMI and in PC mode over HDMI, while taking steps to ensure that AMP is definitely off. If the numbers are any different, I will re-do the entire test and post the pictures. If you'd like to test out your set, id0l, they are available at this page http://tft.vanity.dk/