Windows 10: Laptop display dim, but only on battery

After upgrade to W10 from 8.1, Laptop display is dim, but only when I boot up on battery power. Samsung NP470R5E with Intel HD Graphics 4000


When plugged in, the display has normal brightness.

If I disconnect the power it stays bright.

If I shutdown and restart on battery, the display is dim and cannot be brightened with the function keys.

When I go into settings, all display indicators falsely report 100% brightness.


If I connect mains power after starting on battery, the display remains dim.


All display and monitor drivers have been reviewed and are up to date.

All monitor and display drivers have been uninstalled and reinstalled.

All battery power saving setting have been reviewed. Everything reset to maximum performance.

All display and monitor settings have been reviewed, including advanced settings, and set to maximum performance/100% brightness, etc.

Multiple other combinations of settings tested for battery and display.

sfc/scannow did not find any "integrity violations"


Display remained dim after restart on battery in all tested combinations of settings

:)

 

Laptop goes brighter when on battery, dim when plugged in

My dads laptop has been having this issue for a bit he says. He was having an error on boot that had an issue with the battery. And his battery couldnt hold a charge so i had him replace it. Thats all gone, but the dimming issue when plugged in is still there. I adjusted the brightness in ATI catalyst control panel but that just changed the white balance more than anything. I cant find a brightness setting in Win XP like I can in windows 7. Suggestions?

 

display dimming

Hi,

There's a possibility that this issue is due to the Display settings of your device. For us to isolate your concern, we'd like to ask a few questions:

• Is it only happening when you connect your device to Windows 10?
• If it's not connected, have you noticed certain activities wherein the screen dims automatically?
• Have you tried using a different HDMI cable?
• What troubleshooting steps have you tried so far?

We hope to hear from you soon.

 

Adaptive Dimming

Thank you for providing your answer to the questions.

If that did not resolve your concern, follow the steps below:

• Go back to the first setting that you've tried (Refer to your screenshot).
• Under Dimmed display brightness, change the value of
  On battery and Plugged in option to "0".
• Click Apply and restart your computer.

Changing the value to "0" won't automatically reduce the display brightness of your computer.

Let us know how it goes.

Thanks.