Has the kernel patch that Raymond pointed to been added upstream? Unfortunately, the Windows driver only enables S/PDIF on the card until the Xonar U3 is unplugged, so there isn't even a workable workaround.
Has the kernel patch that Raymond pointed to been added upstream? Unfortunately, the Windows driver only enables S/PDIF on the card until the Xonar U3 is unplugged, so there isn't even a workable workaround.