I think it's likely the nvidia prime postrm script that did it.
snippet:
case "$1" in
purge|remove|upgrade|failed-upgrade|abort-install|abort-upgrade|disappear)
# Remove the xorg.conf
if [ -f $xorg_conf ]; then
mv $xorg_conf $xorg_conf.$now
fi
** Also affects: nvidia-prime (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1307546
Title:
DPI really messed up after upgrade
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