that's likely the intel driver, reassigning there, the Xorg.0.log log
should have the information
** Changed in: xserver-xorg-video-intel (Ubuntu)
Sourcepackagename: gnome-control-center => xserver-xorg-video-intel
Status: Incomplete => New
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action on one display causes "noise" on the other display
https://bugs.launchpad.net/bugs/223735
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