Hello, I realized that only one read access is possible to devices that use the cx88 driver. In my case it is a Hauppauge WinTV Nova-S-Plus DVB-S card. You can reproduce it with the following test: Launch femon concurrently two or more times. Only one femon is able to read from the card. Oliver Endriss confirmed that bug after looking in cx88-dvb.c. Usually, only one write access but an arbitrary amount of read accesses should be allowed. Greets, Fabian _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb