That's correct behaviour for the moment. There's no artwork for higher resolutions.
** Changed in: usplash (Ubuntu) Status: Unconfirmed => Rejected -- Recent changes break usplash resolution - Toshiba Tecra A5 https://launchpad.net/bugs/56288 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs