Executing echo 'standby 0' | cec-client -s /dev/ttyACM0 toggles the power state for a Samsung UE46F6470 TV
echo 'standby 0' | cec-client -s /dev/ttyACM0
can you pastebin the full log output please. looks like a problem on samsung's side as I've never heard of anything like this
I cannot reproduce this with the latest code:
echo "standby 0" | cec-client -s
opening a connection to the CEC adapter...
DEBUG: [ 808] << requesting power status of 'TV' (0)
TRAFFIC: [ 808] << 10:8f
TRAFFIC: [ 958] >> 01:90:01
DEBUG: [ 958] TV (0): power status changed from 'unknown' to 'standby'
DEBUG: [ 958] expected response received (90: report power status)
DEBUG: [ 959] >> TV (0) -> Recorder 1 (1): report power status (90)
NOTICE: [ 959] << putting 'TV' (0) in standby mode
TRAFFIC: [ 959] << 10:36
Perhaps it took some time before Debian got the newest version.
I can't reproduce it either.