@vstrglv wrote:My wife prefer don't think about WB, simple turn on cam and start recording.
LOL. My wife is just the same. She does have a point though. 
Actually, thinking about this afterwards, that test system (whilst appropriate for determining the color temp of the light source) is probably not the best way to evaluate the behavior of AWB. AWB systems, in essence, work by evaluating the scene and determining the most appropriate white (and/or nearest to neutral) reference(s) for correcting the color balance. Generally speaking they work best when the color temperature of the ambient light is in the 3000 - 7000K range and I think that's probably true of all digital cameras. If there is an over abundance of one color (or similar hues) and/or no reliable white/neutral reference in the scene, it can be easily 'fooled' resulting in an image that has a color cast.
When you manually white balance with a grey card (or in this case a sheet of white), you are telling the camcorder that what it 'sees' is white/neutral. And when you select a WB preset you are telling the camcorder what the color temperature of the scene is, so it can make the apprpropriate corrections for shifting to 'neutral' color temperature (which is essentially 'daylight balance'). Testing AWB in this way you are, in effect, presenting the WB system with a uniform 'color' (i.e. white tinted by light reflected off the paper), so it has to interpret that as best. The further away that 'tint' is from neutral the harder that gets and the AWB alogorithm could well incorprorate limits. That might well explain why AWB is getting 'stuck' with a warm cast in your tests.
Really a better way to evaluate AWB under those conditions (short of judging whether it looks 'about right') would be to place a digital grey card (ideally) in the scene and bring the test clip into an editing/grading software that has an 'RGB picker' tool so you can assess how close to neutral the RGB values are on the card.
