test-mode not working when built on top of lp:lightdm, quantal version works fine

[Matt Fischer]

I built lightdm based on lp:lightdm and --test-mode isn't working, the window comes up and it immediately dies:

Main branch: rev: 1569:
mfisch@caprica:~/experiments/lightdm/master$ ./src/lightdm --test-mode
mfisch@caprica:~/experiments/lightdm/master$ echo $?
1

Ubuntu branch rev 1124:
mfisch@caprica:~/experiments/lightdm/ubuntu-master$ ./src/lightdm --test-mode
mfisch@caprica:~/experiments/lightdm/ubuntu-master$ echo $?
1

When I run the installed lightdm with test-mode it works great.