If they are a different problem, it would be best to open a new bug report.
However, if the cause is the same it may all relate to one specific graphics
driver. Can you tell us which version of the nvidia driver you are using please?
Assigned to xorg for now.
** Package changed: ubuntu => xorg (Ubuntu)
** Changed in: xorg (Ubuntu)
Importance: Undecided => Medium
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/683165
Title:
ugly permanent artefact on minimizing
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