Screen dimming and brightening on its own.

My monitor seems to be dimming and brightening on its own. My system is a desktop with a monitor which is really a flatscreen tv.

Everytime I close out something the screen dims. When I open up something it brightens again but it may not stay bright. When doing MS Word it will dim and brighten as I do key strokes or scrolling.

Right now as I'm composing this thread, it is staying bright.

I just scrolled up to the top of the screen and it dimmed (looking for post button which I now see is below and not up).

What TV do you have? Some TVs have dynamic contrast, local dimming, eco mode, or similar features that will dim the part or all of display based on ambient light and/or what is being displayed on the screen. You can try turning off these features to see if they make a difference.

I have a Hannspree M19N3.

Sounds very familiar, I get that irritation on my Laptop now and again. Some of this is probably also applicable to Desktops. It comes under the general banner of "Adaptive brightness and Power saving".

1) Power Options - Power and sleep > Additional power settings > Change plan settings > Change advanced power settings.
Scroll down the list to Display and expand that branch.
Disable adaptive brightness.
Make Dimmed display brightness the same as Display brightness.
Apply > OK etc.

2) Intel HD graphics - Right click desktop > Graphics Properties...
Power > Plugged in > Graphics Power Plans > Maximum performance.
Other modes may auto-dim/bright the display.
Apply etc. You can save that Profile if you wish.

You may have other options, but the principle is the same.

I always have to do both to stop the irritating adaptive brightness thing.

This is addition to similar things on a Monitor/TV.

Thanks for your input.

I tried another monitor/tv and it did not dim/brighten randomly. So I will now focus on the hannespree.

Thank you again.

These options did not work for us.
There are hundreds of suggestions about how to fix this. Different things work for different people because the computers and the software differ so one solution will work for one person but not another. Our symptoms were that on battery power after a number of seconds (did not time it but it was probably 10 or 15 seconds) our display would dim if we were not actively typing on the keyboard. We have a Lenovo X1 Nano with Windows 10 Professional.

We tried a LOT of things that did not work. Like turning the Intel Graphics Command Center Power Saving Option to off. Also hacked the registry to re-enable the Auto Dimming setting in the Advanced Windows Power option so we could turn it off (set it to 0). Also noticed the Night Light was already off so that was no help. Did a registry hack to permanently disable the Adaptive Brightness settings.

We tried a LOT of other things and NOTHING worked for us.



We finally did find something that seems to work. It may not work for you, but I am posting it because it might work for some people since it worked for us.



We went to Device Manager -> Batteries -> Microsoft ACPI-Compliant Control Method Battery and right clicked on it. Then we selected 'Disable Device'.



So far nothing else has been affected. Interestingly enough, the Intel Graphics Command Center Power controls disappeared from that application interface.



It has stopped the auto-dimming where nothing else we tried has succeeded.