March 2, 2011 Patch (Portal)

{{Patch layout
 * game = portal
 * source      = http://store.steampowered.com/news/5080/
 * source-title = Half-Life 2, Portal, Half-Life: Episode One and Half-Life: Episode Two Updates Released
 * before      = November 12, 2010 Patch (Portal)
 * after       = N/A
 * notes       =

Half-Life 2, Portal, Half-Life: Episode One and Half-Life: Episode Two
}}
 * Better support for Intel Sandy Bridge based machines
 * Fixed a bug where some video configuration could get reset by restarting the engine