I am using vdr 1.3.37 on full featured thechnisat Rev 1.3 card. Drivers are from kernel 2.6.14.  I have another digital receiver connected on the loop output of the ss1 board. After closing  vdr by ctrl-c in console  the ss1  in not powering anymore the LNB  leaving the other receiver to do that but is not allowing the high frequency  signal to pass trough (I presume ) since the other receiver is indicating bad signal. If I restart the computer all is ok until I start again vdr.  I don't know if the problem is from vdr or drivers.