Oh. Actually this looks like a "feature". To turn it off go to:
Settings > Universal Access > Visual Alerts = OFF
** Changed in: linux (Ubuntu)
Status: Incomplete => Invalid
** Changed in: nvidia-graphics-drivers-435 (Ubuntu)
Status: Incomplete => Invalid
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https://bugs.launchpad.net/bugs/1869549
Title:
[nvidia] Whenever a sound needs to be played the screen blanks out
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