I'm not certain the release upgrader made this change. xorg_fix_proprietary.py does look at xorg.conf but it doesn't back it up and it doesn't look like it ran during your upgrade.
2014-04-14 08:45:36,097 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
2014-04-14 08:45:36,134 ERROR got error from PostInstallScript ./xorg_fix_proprietary.py (Failed to execute child process "./xorg_fix_proprietary.py" (No such file or directory))
I'm not certain the release upgrader made this change. xorg_fix_ proprietary. py does look at xorg.conf but it doesn't back it up and it doesn't look like it ran during your upgrade.
2014-04-14 08:45:36,097 DEBUG Running PostInstallScript: './xorg_ fix_proprietary .py' fix_proprietary .py (Failed to execute child process "./xorg_ fix_proprietary .py" (No such file or directory))
2014-04-14 08:45:36,134 ERROR got error from PostInstallScript ./xorg_