This is caused by having the nvidia proprietary drivers installed. They
replace libGL with a version that doesn't work for Intel (or radeon),
and produces the strange inverted display you see.
If you haven't deliberately installed the nvidia drivers then this was
probably caused by a bug in a previous version of the mplayer packaging,
which would incorrectly cause the nvidia drivers to be installed.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Confirmed => Invalid
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system GUI turn upside down when visual effects changed from none to normal
https://bugs.launchpad.net/bugs/267269
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which is subscribed to xserver-xorg-video-intel in ubuntu.
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