[mythtv-users] HDMI-CEC ?

Dan Wilga mythtv-users2 at dwilga-linux1.amherst.edu
Tue Oct 25 19:22:40 UTC 2011

On 10/5/11 3:02 PM, Nick Rout wrote:
> On Thu, Oct 6, 2011 at 7:30 AM, Dan Wilga
> <mythtv-users2 at dwilga-linux1.amherst.edu>  wrote:
>> On 10/5/11 8:39 AM, Dan Wilga wrote:
>>> I seem to recall that some video cards support CEC commands, without
>>> using a special adapter. Having upgraded to a newish video card a while
>>> back, I'm going to look into this further before I buy the adapter.
>> Replaying to myself: While it's theoretically possible for a video card
>> to send/receive CEC data over HDMI, it's apparently only supported in
>> hardware by one or two manufacturers at this point, and not at all at
>> the driver level by nVidia. At least that's what Google came up with.
>> So, I ordered an adapter. I'll see how I fare at sending the appropriate
>> on/off commands once it arrives (in 5-7 days).
> Excellent, a guinea pig :)

Sadly, I am unable to get the Pulse-Eight CEC adapter to work with my 
TV. This is no fault of Pulse-Eight, it's due to the undocumented 
SimpLink extensions to the CEC protocol used by my LG TV. It's looking 
for a particular handshake from the PC; without it, the TV will accept 
Power On requests and little else. If I had another LG device, I might 
be able to reverse-engineer what's going on, but I don't.

Dan Wilga                                                        "Ook."

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