[mythtv-users] CEC support on Raspberry Pi 3

[Matthew Zimmerman]

So I have a Raspberry Pi 3 running mythfrontend 0.28 on raspbian jessie
 with which overall works beautifully, but the icing on the cake would be
to get CEC functionality working so I can control mythfrontend with the TV
remote (definitely a wife-acceptance-factor!)

2016-07-09 08:38:06.693291 C  mythfrontend version: fixes/0.28
[v0.28-32-g6eff083] www.mythtv.org
---- SNIP ------
2016-07-09 08:38:08.833406 I  CECAdapter: Found 1 CEC devices(s).
2016-07-09 08:38:08.833503 I  CECAdapter: Device 1: path 'Raspberry Pi' com
port 'RPI' SELECTED
2016-07-09 08:38:08.833522 I  CECAdapter: Trying to open device Raspberry
Pi (RPI).
2016-07-09 08:38:08.834810 I  CECAdapter: connection opened
2016-07-09 08:38:09.158714 I  CECAdapter: registering new CEC client -
v3.0.1
2016-07-09 08:38:09.910458 E  CECAdapter: AllocateLogicalAddresses - failed
to allocate device '0', type 'playback device'
2016-07-09 08:38:09.910497 E  CECAdapter: failed to find a free logical
address for the client
2016-07-09 08:38:09.910608 E  CECAdapter: failed to register the new CEC
client - cannot allocate the requested device types
2016-07-09 08:38:09.910679 E  CECAdapter: Failed to open device.
2016-07-09 08:38:09.910695 E  CECAdapter: failed to register a CEC client
2016-07-09 08:38:11.336293 I  CECAdapter: Closing down CEC.

https://www.mythtv.org/wiki/Raspberry_Pi states that CEC support should
work in this case.  This isn't a hardware thing because cec-util works
beautifully.

How can I debug this further?  I'm not shy of writing some code to fix it,
although my C is not great.

Thanks for this working as well as it does!
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