In order to get Portal 2 working with your logitech rumblepad 2 you have to do the following...Download the files from :
http://rapidshare.com/files/343322681/xbox360cemu.v.3.0.rar
or
http://xinput.googlecode.com/files/xbox360cemu.v.3.0.rar
Extract the files :
xbox360cemu.ini
xinput1_3.dll
Copy the following file to the following folder :
xbox360cemu.ini
\Program Files\Valve\Portal 2\
Rename the file in folder :
\Program Files\Valve\Portal 2\bin\
xinput1_3.dll to xinput1_3.dll.old
And copy the file from the download to the directory :
xinput1_3.dll
\Program Files\Valve\Portal 2\bin\
So you end up with the following adjustments :
\Program Files\Valve\Portal 2\xbox360cemu.ini (10kb)
\Program Files\Valve\Portal 2\bin\xinput1_3.dll.old (68kb)
\Program Files\Valve\Portal 2\bin\xinput1_3.dll (76kb)
You now start the game from :
\Program Files\Valve\Portal 2\portal2.exe
Now off you go to enjoy this game using your logitech rumblepad 2 or dual action game pad.