Tvheadend

system version: PPA installed, HTS Tvheadend 3.2.18~g40a8920~precise, 64 bit, Ubuntu 12.04
hardware: TBS 6981 S2 dual tuner

Problem:
(1) After enable "Close device handle when idle" option on both of the tuner, only single tuner namely "/dev/dvb/adapter1/" closed and logged in the WebUI.
(2) when checking with "sudo lsof -p $(cat /var/run/tvheadend.pid) | grep -i /dev/dvb", the /dev/dvb/adapter0 is still active
(3) all the EPG grabber has been disabled to prevent any period EPG update.
(4) user have to manually select adapter0 with streaming channel, e.g.
mplayer -xy 0.5 http://poseidon.ookyy.net:9981/stream/service/_dev_dvb_adapter0_TurboSight_TBS_6981_DVBS_S2_frontend10803000_H_satconf_1_1946
and stop streaming, to get the tuner closed.