[LightDM] how is start-default-seat supposed to work?

[Greg Klanderman]

Hi,

I would like to have lightdm only run on seat-1, and not seat0.
I am running debian testing, with lightdm 1.26.0-7.

Based on the description of the start-default-seat option in
data/lightdm.conf, i.e.:

# start-default-seat = True to always start one seat if none are defined in the configuration

I expected that setting this option to false would mean that a seat
would only be started in lightdm if there were specific config lines
for that seat.  So generic [Seat:*] configs would not be considered
for purposes of whether to start a specific seat; to start on seat0,
you would need some config lines under [Seat:seat0], and likewise in
order to start on seat-1, you would need some config lines under
[Seat:seat-1].

However, that did not work, and looking at the code in src/lightdm.c,
it appears that setting start-default-seat=false, lightdm never starts
any seats.

To achieve my goal, I could imagine fixing start-default-seat to work
like I expect, as it does not seem at all useful currently, or adding
a new seat section config option to inhibit starting a seat.  Please
let me know what you think of these options.

thanks,
Greg