I've found out!
It's definitely a compiz issue. While changing desktop wallpapers and compiz
turned on, there is a memory leak as I explained in my first post here. As soon
as I disable compiz and change the wallpaper, all leaked memory is freed and
Xorg's memory usage normalizes.
Then, if I enable compiz again, memory leaks again. So it definitely must be a
compiz issue, because it happens on both ATI and NVIDIA.
** Also affects: compiz (Ubuntu)
Importance: Undecided
Status: New
** Changed in: nvidia-graphics-drivers-173 (Ubuntu)
Status: Incomplete => Invalid
** Changed in: xserver-xorg-video-ati (Ubuntu)
Status: Incomplete => Invalid
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xorg memory leak when changing desktop wallpapers (Gnome)
https://bugs.launchpad.net/bugs/254107
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