Windows 10: How to get Windows 10 to control brightness of EXTERNAL Monitor connected to laptop computer

My SP3 (Windows 10, i5 4300) is always connected to an external monitor through the mini dp with an HDMI adaptor and cable to the monitor(s)

but the brightness setting from Windows itself can't control the brightness of external monitor(s)

for instance, when i slide the brightness bar only the brightness of the SP3 itself will change but not the external monitor(s)

I have installed most up to date drivers for the graphic card and the monitor(s)

Hard control on the monitors will be sort of disabled as long as connected to SP3 (nor an older laptop with Win10), the slider can move from 100 to 0 but brightness won't change

However, even though the hard control can be made working, I still not gonna use it as I would prefer the auto dimming function that's come with the SP3 or most other laptop nowadays.

I have seen someone say HDMI or DP can't transfer hardware control info/ command which i doubt..... if that's the case then are we suppose to switch back to D-Sub?

I currently using Pangolin to "Dim" the external monitor, however it isn't a genuine control. Instead it's adding a layer of grey (or other color) on top of what's displaying. The Windows menu, context menu and task bar ain't dimmed. And when doing screen capture, the pictures are greyed per the "dim" amount.

So my question is is there anyway that I can get the SP3 (or other laptop) to control the brightness of external monitor(s).


ps from my memory I'm having this issue since perhaps more than 10 years ago when my desktop has DVI-HDMI connection with the monitor.

:)

 

monitor brightness?

Hi Tom,

To change your Windows 10 monitor brightness, we suggest that you follow the steps below:

• Click the Windows logo; then, search for Control Panel.
• Select Hardware and Sound.
• Choose Power Options.
• On the next screen you should see brightness slider at the bottom of the Control Panel window.
  

We would appreciate it if you could get back to us and provide us your feedback.

 

Can't adjust brightness on external monitor

It's got everything to do with Windows 10 because that's the operating system that should let me control the brightness of an external monitor. The Surface Book is both a tablet and a laptop, so there's nothing weird about connecting an external monitor
to it. What do you mean by "this country"? This forum is international.

 

Can't adjust brightness on external monitor

A surface book is a tablet, which is irrelevant when the heading says EXTERNAL monitor. And no, there obviously aren't any buttons on
LED Cinema Display monitors, otherwise I wouldn't have posted this message.

By the way, by spending hours searching the Internet and doing some serious "hacking" I have now managed to control the brightness on the external monitor. Not thanks to this forum or Microsoft's audacity
to offer paid support for something as simple as getting a £2500 computer to
control the brightness of an external monitor.