I have solved the problem with the bew DFE-500TX REV-E1. The solution was easy. I uppgraded to version 0.91 (not present in the 2.2.9 kernel) and everything now works ok. Thanks a lot to Dietrich Beck & Peter Mogensen who both suggested this solution (since they have had the same problem as me with the old driver and REV-E1). /Jakob --