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Surface poro 4 display issue when using vga through dock


New Member
i have a surface pro 4 and dock.
when i connect to my monitor (dell u2412) or Samsung tv via vga (using vta to mini displayport adapter)through the dock, the screen is jumpy, and moves sideways occasionally like interference on an old analog tv.
There is no issue on either tv or monitor if i connect directly to the surface.
There is also no issue if i connect via hdmi.

It seems like there is an issue when using VGA through the dock. Has anyone experienced this?