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I don't know how long it's been going on, but it's been noticable since I installed Teslamate a few weeks ago.
The attached screen shot from Tesla mate shows our Model 3 (which is sleeping) and our Model S (which isn't).
It's a May 2017 60(75)D with MCU1.
Teslamate is the only third party...
We picked up our Model S in mid 2017 and on ordering was told it had homelink.
It said it had it but we could never get it to work. We let it go. I hassled Tesla a little before we were due to pickup our model 3 and the service department tells me it was a firmware error and it didn't have it...