The three-day bash takes place in St Germans, near Saltash on July 24-26.
Other musical acts confirmed to appear include Noah And The Whale and Ralph McTell.
The festival also features a special area hosted by Caught By The River, which will see DJ sets from Saint Etienne‘s Bob Stanley, readings by Jon Savage and a solo set by The Magic Numbers‘ frontman Romeo Stodart.
The full list of musicians playing Porteliotfestival.com is:
AJ’s Big Band
British Sea Power
Dulwich Ukulele Club
Louis Eliot & The Embers
My Window Faces South
Noah and the Whale
The Antonius Players
The Boathouse featuring One Minute Disco
The Lani Singers
The Loose Salute
Weekend and day tickets for the festival are on sale now. See Porteliotfestival.com for more information.