Tvheadend

Hi,

i have an Openelec running woth an XBMC PVR version including a Technotrend TTS2-3600 USB.

information in tvheadend is as follow :

Hardware
Device path:
/dev/dvb/adapter0
Device name:
STB0899 Multistandard
Host connection:
USB (480 Mbit/s)
Intermediate Frequency range:
950000 kHz - 2150000 kHz, in steps of 0 kHz
Symbolrate range:
1000000 Baud - 45000000 Baud
Status
Currently tuned to:
11,953,500 kHz Horizontal (LNB1)
Services:
0
Muxes:
1
Muxes awaiting initial scan:
1

when adding a mux , it drops to 0

if i do a dmesg , i get :

[ 540.303687] pctv452e: I2C error -121; AA 58 CC 00 01 -> 55 58 CC 00 00.
[ 540.317319] pctv452e: I2C error -121; AA 6F CC 00 01 -> 55 6F CC 00 00.
[ 540.370318] pctv452e: I2C error -121; AA 8B CC 00 01 -> 55 8B CC 00 00.
etc....

the signal of the stream is fine, if i plug it into my receiver it works.

maybe i have to add that i have a 17/8 multiswitch hooked to it and all my LNB's are quattro LNB.

Any idea what it could be or where to start looking ?

Thanks