LightDM and .dmrc

[Nicolas George <george@nsup.org>]

Hi.

I just ran the following tests with lightdm (and the default Gtk
greeter, but the same issue seems to be happening with slick and
arctica. Please see below for a summary:

- type login utest
- select fvwm in menu
- type password
- fvwm session opens
- log out
- `~utest/.dmrc` contains `Session=fvwm`
- type login vtest
- select gnome in menu
- type password
- gnome session opens
- log out
- `~vtest/.dmrc` contains `Session=gnome`, `~utest/.dmrc` unchanged
- type login vtest
- do not touch the menu
- type password
- gnome session opens

- update `/etc/lightdm/lightdm.conf` with `greeter-hide-users=false`
- both `.dmrc` contain `Session=gnome`
- select utest in users list
- select fvwm in menu
- type password
- fvwm session opens
- select vtest in users list
- the menu icon immediately switches to a gnome foot
- type password
- gnome session opens
- log out
- select utest in users list
- the menu icon immediately switches to a wrench
- type password
- fvwm session opens

- `dpkg-reconfigure gdm3` and select gdm3
- select utesst in users list, select fvwm, type password, log out
- select vtesst in users list, select gnome, type password, log out
- check `.dmrc`
- select utest in users list, type password
- fvwm session opens

So, in short, and in reverse order:

With gdm3, users are logged into the kind of session they used last.

With lightdm with users list, same.

With lighdm and the default config of hidden users list, users are
logged into the kind of session chosen by the last person who chose one.

The behavior of lighdm without users list seems invalid. Do you agree? I
want to check before submitting a bug report.

By the way, if somebody already has a comparison of DMs… I am looking
for one where the screen background is well exposed for our nice
backgrounds and lets users choose their session types without forcing
one on them.

Regards,

-- 
  Nicolas George