Looks like it was never properly implemented in LightDM. I've fixed this for LightDM 1.3.5 and 1.2.3 and added regression tests to check this works. Unity Greeter (at least) needs to be updated to make this work too.
Looks like it was never properly implemented in LightDM. I've fixed this for LightDM 1.3.5 and 1.2.3 and added regression tests to check this works. Unity Greeter (at least) needs to be updated to make this work too.