[Bug 883189] Re: Need better(-located) documentation on lightdm.conf

[Jacob Nevins]

In addition to everything else said here, the relationship between
/etc/lightdm.conf and the lightdm-set-defaults program needs clarifying.

https://wiki.ubuntu.com/LightDM#Configuration_and_Tweaks suggests that
"[lightdm.conf is not] suppose to be directly edited, instead use:
lightdm-set-defaults".

Is that actually true? On Precise at least, the program is not mentioned
in lightdm(1) (where lightdm.conf is mentioned), nor in
/etc/lightdm.conf, nor in /usr/share/doc/lightdm/lightdm.conf.gz. Also,
the program doesn't have its own man page, and lives in /usr/lib/lightdm
/lightdm-set-defaults where it's not obvious to find. And according to
its --help it only allow changing a small subset of the options
mentioned in the example lightdm.conf.

That suggests to me that it's intended to be a helper progam for use by
packages or GUI configuration tools. If so, and as a system
administrator I'm expected to edit lightdm.conf directly, what rules do
I have to follow to not clash with automatically made changes from
lightdm-set-defaults?

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https://bugs.launchpad.net/bugs/883189

Title:
  Need better(-located) documentation on lightdm.conf

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