After upgrading to drupal 7.2, enabled Pathauto, then,
1. configured URL aliases settings as follows:
Administration » Configuration » Search and metadata » URL aliases
Verbose
Separator -
Leave case the same as source token values.
Maximum alias length 100
Maximum component length 100
Update action
Do nothing. Leave the old alias intact.
and, 2. URL aliases pattern made all null.
As the result, content URL made something like
mysite.com/content/[title]