For one, that's not your screen. It's called tearing, and is entirely related to the graphics chip redrawing faster than the screen can refresh.

Your device still works, and it's probably being ignored because it has zero impact on the functionality of the device.

Second, I recall somewhere (unofficially) that it was fixed. Wouldn't be the first time that something was going to be "Fixed in Harmattan" or WONTFIX for Maemo5 that actually did get fixed.

That said, their response to the issue is somewhat off-putting. I suppose a more "diplomatic" phrasing would have been better.