External display show minor jitters when T430 connect with external display using VGA

[buddha1987]

Does anyone find that when T430 connects with external display using VGA, if you show a white screen, I can find some horizontal jitters. It is not that obvious, but if you show a white screen, or most of screen is white, and you check it carefully, you can see that horizontal jitters. This only happens in external display, not happen in the laptop display.

I also have a T420, but I didn't see this problem using VGA to connect with external display.  Does anyone find this similar problem?

I doubt whether this is problem about VGA port, or the related driver. VGA should be a analog port.

[buddha1987]

I checked the forum and see this:

VGA output noise

https://forums.lenovo.com/t5/T400-T500-and-newer-T-series/VGA-output-noise/m-p/1596622#M98647

I think what I saw is the exact same problem mentioned in this thread. But how should I fix it?

Thanks.

[buddha1987]

In BIOS, I disable the OS detection for NVIDIA Optimus. Then I only use discrete graphic card NVS5400. Now it seems the VGA noise gone, anyone has the similar experience?

Thanks.