This is a strange question and I am absolutely not sure if this is the right place to ask. However, I'll give it a try:
I have a Asus Zenbook notebook. The notebook only has a HDMI/Display port input. When I want to connect it to an older projecter, I use a VGA to Display port adapter. However, there is one projecter in our university, where I experience random noise on top of mouse movements when using the touchpad. Let me explain this:
I place my notebook on a table, connect it via VGA to DP adapter to a VGA cable that is connected to the projecter. As soon, as I plug in the adapter to my notebook, when using my touchpad, the movements experience random jumps and clicks and it makes my notebook unusable.
However, the moment I touch the body of my notebook, this does not happen any longer. Also picking up my notebook and using the mouse pad while holding the notebook in my hands does work.
The problem only occurs with this specific projecter. Different VGA cables and a different adapter did not change anything.
So my (uneducated) guess is: This has something to do with the notebook not being grounded. I also tried to plug the power adapter in, but this did not help.
My question: Is my guess correct? If so, is there an easy hack to get rid of this problem?
Also, since I am really not sure if this is the right place to ask, any references are very much appreciated.
Thank you very much.