I discovered that disabling the xorg "Composite" extension fixes this
issue for me (For the record, I was having this issue with the
commercial NVidia drivers, not Intel).
In your /etc/X11/xorg.conf add this, and then restart X:
Section "Extensions"
Option "Composite" "Disable"
EndSectio
For the record, I am experiencing the same behavior, but I am using the
binary "nvidia" driver, not intel. The problem seems especially likely
to occur when switching to/from terminal windows and emacs instances.
As soon as the parent window decides to redraw, the artifacts vanish. I
experience p
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