Turn on tv using cec-client on RPi3

Question

Running latest Libreelec with latest Kodi on RPi3.

I can successfully turn off the tv using:

echo "standby 0" | cec-client RPI -s -d 1

and

echo "tx 10:36" | cec-client RPI -s -d 4

But turning the tv on is not possible. I don't know if it's my Sony Bravia.

I'm executing echo "tx 10:04" | cec-client RPI -s -d 4 and echo "on 0" | cec-client RPI -s -d 1, neither of which work.

Hoping someone can shed some light on this. I do see this in the log after running the 'on' command:

marking opcode 'image view on' as unsupported feature for device 'TV'

Just want to know if there is a workaround or there is no chance of it working.

Answer 1

I'm not sure why that wouldn't work; Both of your commands are correctly formatted. I don't think it's because your TV is Sony, though (source), but it may be that your TV doesn't support CEC when it's in standby (I think that's against the specs, so I'm not sure).

Since you see that error:

1. Your TV sent back a "Feature Abort" meaning that it got the command, but doesn't support it.
2. Maybe you never got a response from the TV at all, which would make me think that the TV was fully powered off or doesn't support CEC in standby, which seems counter-intuitive.

Posting the full output (leave off -d 1) may help get to the bottom of it.

If you are feeling up to digging through the HDMI CEC Specs, I found them here.