September 18, 2012 Patch

{{Patch layout
 * source = http://store.steampowered.com/news/8880/
 * source-title = Portal 2 Update Released


 * before   = August 29, 2012 Patch
 * current  = September 18, 2012 Patch
 * after    = November 20, 2012 Patch


 * notes =

Portal 2
}}
 * Fixed departure elevators not properly playing their informational videos.
 * Fixed overly shiny ground in certain maps.
 * Reduced development spew from previous updates now that the Workshop bug that affected a small number of users has been corrected.