Samsung 24-inch display auto-dimming problem

Right out of the box 3 or 4 months ago, my Samsung 24 inch 2443 BW dims uncontrollably whenever I have a window open that has mostly black or other dark-colored background - say about 60% black; I can actually watch the whole screen and desktop - not just the window - brighten or darken in response to manipulating the images and/or background color in the window. This is on a G5 1.8GHz dual with a GeForce FX 5200, running 10.4.11. It doesn't depend on the ambient light. The System Prefs doesn't offer any way to control auto-dimming. I'm thinking it could be a driver problem, maybe related to the fact that I am still using 10.4.11.
Has anyone had a similar problem and found a fix or workaround? Thanks.

Problem solved! This morning (yes, I should've done this 6 months ago, soon after I bought the unit). As a prelude to returning the unit to Samsung, I finally took the 2443 BW back to my local Apple (specialist) dealer (not an Apple Store. They're independent and don't usually "do PCs", although they can if required). Of course I made sure I had some images that were guaranteed to demonstrate the problem. Their "service genius" watched the behavior for less than a minute and promptly fixed it. (Kudos! )
All that was needed was to "turn off" the "Dynamic Contrast" option from the Samsung's menu (MENU > Picture > MagicBright > Dynanamic Contrast), by selecting one of the other (static) options instead - I preferred the "Sport" option.
When I got it reconnected at home, I adjusted the contrast and brightness settings on the Samsung's Menu to suit me. I am also using the (Apple > System Preferences > Displays > Color > Adobe RGB (1998) Display profile instead of the one labeled "SyncMaster"). The SyncMaster display profile makes the screen look very washed-out.
This dialogue has definitely helped, by helping to pinpoint the monitor itself as the most likely source of the problem.
Cheers

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Samsung 24-inch display auto-dimming problem

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