Hello
my configuration is:
OpenMediaVault 1.0.23
Kernel 3.2
Technotrend TT Connect S2-3600
tvheadend 3.4
when the Tvheadned try to scan transponder the S2-3600 is become offline (red led indicator)
and the signal is 0%
on the syslog i got the error:pctv452e: I2C error
The DVB-S2 card is working good on different computer with openelec OS or windows 7
someone have a solution for it?
Thanks... 
Code
dmesg | grep dvb
5.434435] dvb-usb: found a 'Technotrend TT Connect S2-3600' in warm state.
[ 5.435391] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
[ 5.439315] dvb-usb: MAC address: 00:d0:5c:61:60:2a [ 5.573726] dvb-usb: schedule remote query interval to 100 msecs.
[ 5.573739] dvb-usb: Technotrend TT Connect S2-3600 successfully initialized