The latest updates of Portal 2 PC patch is coming! Besides a few other changes such as expanded joystick support and a bunch of localization improvements, these updates include some fixes, some ...
Portal 2 PC patch which launched this past weekend on Steam has fixed a few of these irregularities of Portal 2 PC version. Then you can gain detailed information from the following news.

Portal 2 PC Patch Mainly Fixed
Fixed: Occasional crash after Alt-Tab/minimizing or running in a window on certain graphics hardware.
Fixed: Crashes and/or graphical glitches after changing video settings
without exiting Portal 2.
Fixed: Player stuck at the beginning of
Portal 2 Chapter 6.
Fixed: Crash attempting to use other weapons (e.g. mods) with Portal 2.
Fixed: Mouse cursor doesn't highlight UI elements in
Portal 2 on Mac OSX.
Fixed: Numerous localization bugs and improvements (also added Czech and Turkish localized text).
Fixed: Overflow bug in
Portal 2 keyvalues.
Fixed: Voice functionality regression (voice again enabled by default).
Fixed:
Portal 2 joystick now defaults to off in order to avoid issues with non-joystick hardware that registers itself as a joystick.
Fixed: French sentences are not wrapping correctly in subtitles and commentary.
Portal 2 PC Patch Mainly Improved
Improved: Handling of Mac OSX crashes.
Improved:
Updates and bug of Portal 2 fixes to Robot Enrichment.
Improved: Reliability on unsupported Intel Mobile Series 4 Express chipsets.
Portal 2 PC Patch Mainly Removed
Removed: Unsupported console commands ("retry", "switch_teams") that
caused Portal 2 problems if used.
After the
fix of Portal 2 PC patch, the Portal 2 PC version is running smooth like butter now.
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