Looks like Chris may have been right after all and I was wrong.
See this comment in the original freedesktop bug:
https://bugs.freedesktop.org/show_bug.cgi?id=33592#c15
I'm not in front of the buggy system right now so I can't completely
verify, but when I remotely ssh to it, I can see that the nvidia .so's
are actually loaded on a system with only intel graphics (used to have
an nvidia card in the past), which is wrong:
$ lsof | grep nvidia | sed -e 's@.* \(/.*\)$@\1@' | sort -u
/usr/lib/nvidia-current/libGL.so.270.41.06
/usr/lib/nvidia-current/libnvidia-glcore.so.270.41.06
/usr/lib/nvidia-current/tls/libnvidia-tls.so.270.41.06
It seems very plausible that the mistakenly loaded nvidia layer is
flipping those pixels.
Will verify this on Tuesday.
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https://bugs.launchpad.net/bugs/781353
Title:
libgl1-mesa-dri: display inverted (upside-down) in startkde after
natty upgrade
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