Member Avatar for lonevol

Hi guys,

I just encounter an very strange problem with my monitor. My monitor is Samsung 2033. I just build a new PC. Im using intergrated graphic card which is intel G33 Chipset.

When ever my screen display something black, my monitor will auto dim down like power saving mode. Here are some examples.

1. During start up the screen will dim, cos of the black backgroud.
2. Playing Dota, when i move to the explore area (black) the screen will dim.
3. Going to any website that have dark/black interface and background, it will dim too.
4. Playing Avi file which the start is black blank screen.

Have anyone come across this situation before? I tried going to the power saving menu and is not a problem from there. Hope someone can help. Thanks in advance

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  • Latest Post Latest Post by efmesch

Dani AI

Generated

Nice find, — that disappearing-brightness behavior is a common result of automatic backlight or “adaptive brightness” features. Those can live either in the monitor’s on-screen menu or inside the display driver/software, and they dim the backlight when large parts of the image are dark to save power or boost perceived contrast.

Quick checks that help pinpoint the source:

  • Capture the screen (Print Screen) and open the saved image on a different display or device. If the saved image looks bright elsewhere while your monitor still dims, the change is happening as backlight/firmware behavior rather than in the image data.
  • Show a full-screen solid black image versus a small black box. If the whole panel dims only when most of the screen is dark, that points at dynamic backlight/contrast control.
  • Swap the cable or try another computer/monitor to rule out a cable/port or system-specific driver setting.

Practical fixes to try:

  • In the monitor OSD, look for and disable options named “Eco”, “Eco Saving”, “Dynamic Contrast”, “Auto Brightness”, “Ambient Light Sensor” or similar; set picture mode to Standard or User and reset to factory defaults if needed.
  • In the graphics control panel or OS power settings, disable any adaptive/display power-saving options (names vary: DPST, adaptive brightness/contrast, display power saving). Also turn off “adaptive brightness” in Windows Power Options if present.
  • Update the display driver and, if available, the monitor firmware. If the behavior persists, contact the manufacturer or test the monitor on another system.

Turning these features off keeps brightness constant but may change perceived blacks and increase power use. As noted, solving it is satisfying — and these steps will help others who find the same symptom.

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Member Avatar for lonevol

problem sloved! is due to a stupid mode in my monitor. Thanks you!

Member Avatar for efmesch

There's nothing like the satisfaction of solving a "major" problem yourself. Congratulations.
Welcome to Daniweb--people of your ilk are specially welcome here. Keep coming back and looking in to see wheere you can help others.

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