I'm deploying a mobile app using jQuery Mobile 1.1 and Phonegap on BB Torch 9800 OS6. The minimum page height set by calling $.mobile.getScreenHeight is too small causing the background styling not to stretch to fill the viewport. I believe this was broken in 1.1.
In 1.1 $.mobile.getScreenHeight() returns 342, in 1.0 it returns 480
Note this appears only to affect Phonegap apps on BB. Running the same app in the browser $.mobile.getScreenHeight() returns 420 and takes the entire viewport minus the address bar.
The following thread seems to suggest using screen.availHeight instead of window.innerHeight