Public bug reported:

I need to configure a couple of options for the nvidia driver, e.g.
Coolbits. For this I have /etc/X11/xorg.conf which contains purely my
manual configuration. I have found that this file is being renamed
xorg.conf.<MMDDYYYY> at irregular intervals, thereby disabling these
manual settings.

/var/lib/dpkg/info/nvidia-prime.postrm is very likely what's causing
this:

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

Iiuc this is run on every upgrade of the nvidia-prime package. I don't
know the reasons for doing this, but given that /etc/X11/xorg.conf is
still intended (only) for manual configuration, it should not summarily
be moved away. If there's a risk for conflicting old configs then they
should be detected more accurately and handled through the normal tools
that updates/replaces /etc files containing local changes.

** Affects: nvidia-prime (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1345585

Title:
  xorg.conf with manual config is moved away at upgrade

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